Schmal,Martin, Freund,Hans-Joachim
The science of catalysis and surface science have developed, independently, key information for understanding catalytic processes. One might argue: is there anything fundamental to be discovered...
Photoinduced abstraction reactions within NO dimers on Ag(111) (2009)
Kim, Ki Hyun, Watanabe, Kazuo, Menzel, Dietrich, Freund, Hans-Joachim
Modifying the adsorption characteristic of inert silica films by inserting anchoring sites (2009)
Ulrich, Stefan, Nilius, Niklas, Freund, Hans-Joachim, Martinez, Umberto, Giordano, Livia, Pacchioni, Gianfranco
Morphology and CO adsorption on platinum supported on thin Fe3O4(111) films (2009)
Qin, Zhi-Hui, Lewandowski, Mikolaj, Sun, Ying-Na, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Monolayer iron oxide film on platinum promotes low temperature CO oxidation (2009)
Sun, Ying-Na, Qin, Zhi-Hui, Lewandowski, Mikolaj, Carrasco, Esther, Sterrer, Martin, Shaikhutdinov, Shamil, ...
Realization of an atomic sieve: Silica on Mo(112) (2009)
Ulrich, Stefan, Nilius, Niklas, Freund, Hans-Joachim, Martinez, Umberto, Giordano, Livia, Pacchioni, Gianfranco
Göbke, Daniel, Romanyshyn, Yuriy, Guimond, Sébastien, Sturm, Jacobus Marinus, Kuhlenbeck, Helmut, Döbler, Jens, ...
Göbke, Daniel, Romanyshyn, Yuriy, Guimond, Sébastien, Sturm, Jacobus Marinus, Kuhlenbeck, Helmut, Döbler, Jens, ...
Zero-bias conductance anomaly of a FeO-bound Au atom triggered by CO adsorption (2009)
Rienks, Emile D. L., Nilius, Niklas, Freund, Hans-Joachim, Giordano, Livia, Pacchioni, Gianfranco, Goniakowski, Jacek
Partial oxidation of methanol on well-ordered V2O5(001)/Au(111) thin films (2009)
Sturm, Jacobus Marinus, Göbke, Daniel, Kuhlenbeck, Helmut, Döbler, Jens, Reinhardt, Ulrike, Ganduglia-Pirovano, Maria Veronica, ...
Interaction of gold with cerium oxide supports: CeO2(111) thin films vs CeOx nanoparticles (2009)
Baron, Martin, Bondarchuk, Oleksandr, Stacchiola, Dario, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Gold atoms and clusters on MgO(100) films; an EPR and IRAS study (2009)
Yulikov, Maxim, Sterrer, Martin, Risse, Thomas, Freund, Hans-Joachim
Martinez, Umberto, Jerratsch, Jan-Frederik, Nilius, Niklas, Giordano, Livia, Pacchioni, Gianfranco, Freund, Hans-Joachim
Growth of stoichiometric subnanometer silica films (2008)
Stacchiola, Dario J., Baron, Martin, Kaya, Sarp, Weissenrieder, Jonas, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Lian, Ji-Chun, Finazzi, E., Di Valentin, Christiana, Risse, Thomas, Gao, Hong-Jun, Pacchioni, Gianfranco, ...
Adsorption of Au and Pd atoms on thin SiO2 films: the role of atomic structure (2008)
Baron, Martin, Stacchiola, Dario, Ulrich, Stefan, Nilius, Niklas, Shaikhutdinov, Shamil, Freund, Hans-Joachim, ...
A new analysis of X-ray adsorption branching ratios: Use of Russell-Saunders coupling (2008)
Bagus, Paul S., Freund, Hans-Joachim, Kuhlenbeck, Helmut, Ilton, Eugene S.
Hydrogen absorption in oxide-supported palladium nanocrystals (2008)
Wilde, Markus, Fukutani, Katsuyuki, Naschitzki, Matthias, Freund, Hans-Joachim
Charging of metal adatoms on ultrathin oxide films: Au and Pd on FeO/Pt(111) (2008)
Giordano, Livia, Pacchioni, Gianfranco, Goniakowski, Jacek, Nilius, Niklas, Rienks, Emile D. L., Freund, Hans-Joachim
Simon, Georg Hermann, König, Thomas, Nilius, Maria, Rust, Hans-Peter, Heyde, Markus, Freund, Hans-Joachim
Isomerization and hydrogenation of cis-2-butene on Pd model catalyst (2008)
Brandt, Björn, Fischer, Jan-Henrik, Ludwig, Wiebke, Libuda, Jörg, Zaera, Francisco, Schauermann, Swetlana, ...
Gold supported on thin oxide films: From single atoms to nanoparticles (2008)
Risse, Thomas, Shaikhutdinov, Shamil, Nilius, Niklas, Sterrer, Martin, Freund, Hans-Joachim
Growth and charaterization of ultrathin V2Oy (y≈5) films on Au(111) (2008)
Guimond, Sébastien, Göbke, Daniel, Romanyshyn, Yuriy, Sturm, Jacobus M., Naschitzki, Matthias, Kuhlenbeck, Helmut, ...
A scanning tunneling microscopy observation of (√3x√3)R30° reconstructed Ni2P(0001) (2008)
Kinoshita, Kumiko, Simon, Georg Hermann, König, Thomas, Heyde, Markus, Freund, Hans-Joachim, Nakagawa, Yuta, ...
Finazzi, Emanuele, Di Valentin, Cristiana, Pacchioni, Gianfranco, Chiesa, Mario, Giamello, Elio, Gao, Hongjun, ...
Formation of one-dimensional molybdenum oxide on Mo(112) (2008)
Kaya, Sarp, Weissenrieder, Jonas, Stacchiola, Dario, Todorova, Tanya K., Sierka, Marek, Sauer, Joachim, ...
Sun, Ying-Na, Qin, Zhi-Hui, Lewandowski, Mikolaj, Kaya, Sarp, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Wilde, Markus, Fukutani, Katsuyuki, Ludwig, Wiebke, Brandt, Björn, Fischer, Jan-Henrik, Schauermann, Swetlana, ...
Well-ordered V2O5(001) thin films on Au(111): Growth and thermal stability (2008)
Guimond, Sébastien, Sturm, Jacobus M., Göbke, Daniel, Romanyshyn, Yuriy, Naschitzki, Matthias, Kuhlenbeck, Helmut, ...
Size effects in thermal and photochemistry of (NO)2 on Ag nanoparticles (2008)
Mulugeta, Daniel, Kim, Ki Hyun, Watanabe, Kazuo, Menzel, Dietrich, Freund, Hans-Joachim
Wilde, Markus, Fukutani, Katsuyuki, Ludwig, Wiebke, Brandt, Björn, Fischer, Jan-Henrik, Schauermann, Swetlana, ...
Au dimers on thin MgO(001) films: flat and charged or upright and neutral? (2008)
Simic-Milosevic, Violeta, Heyde, Markus, Nilius, Niklas, König, Thomas, Rust, Hans-Peter, Sterrer, Martin, ...
Selectivity in methanol oxidation as studied on model systems involving vanadium oxides (2008)
Romanyshyn, Yuriy, Guimond, Sébastien, Kuhlenbeck, Helmut, Kaya, Sarp, Blum, Ralf Peter, Niehus, Horst, ...
Ulrich, Stefan, Nilius, Niklas, Freund, Hans-Joachim, Martinez, Umberto, Giordano, Livia, Pacchioni, Gianfranco
Counting electrons transferred through a thin alumina film into Au chains (2008)
N. Nilius, Niklas, Ganduglia-Pirovano, Maria V., Brázdová, Veronika, Kulawik, Maria, Sauer, Joachim, Freund, Hans-Joachim
Simic-Milosevic, Violeta, Heyde, Markus, Lin, Xiao, König, Thomas, Rust, Hans-Peter, Sterrer, Martin, ...
Müller, Katharina, Aschersleben, Gisa, Schmitz, Frank, Schnitzler, Alfons, Freund, Hans-Joachim, Prinz, Wolfgang
Vogt, Stefan, Buccino, Giovanni, Wohlschläger, Afra M., Canessa, Nicola, Shah, N. Jon, Zilles, Karl, ...
In this event-related fMRI study, we demonstrate the effects of a single session of practising configural hand actions (guitar chords) on cortical activations during observation, motor preparation,...
Silvestre-Albero, Joaquin, Borasio, Marta, Rupprechter, Günther, Freund, Hans-Joachim
The hydrogenation of 1,3-butadiene on Pd(1 1 1) at 300 K was studied at atmospheric pressure by infrared reflection absorption spectroscopy (IRAS) and gas chromatography (GC). Kinetic measurements...
Formation and catalytic activity of partially oxidized Pd nanoparticles (2007)
Schalow, Tobias, Brandt, Björn, Laurin, Mathias, Guimond, Sebastien, Starr, David E., Shaikhutdinov, Shamil K., ...
Formation of an ordered ice layer on a thin silica film (2007)
Kaya, Sarp, Weissenrieder, Jonas, Stacchiola, Dario, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Brandt, Björn, Schalow, Tobias, Laurin, Mathias, Schauermann, Swetlana, Libuda, Jörg, Freund, Hans-Joachim
Control of the charge state of metal atoms on thin MgO films (2007)
Sterrer, Martin, Risse, Thomas, Pozzoni, Umberto M., Giordano, Livia, Heyde, Markus, Rust, Hans-Peter, ...
X-ray spectroscopic fingerprints of reactive oxygen sites at the MoO3(0 1 0) surface (2007)
Cavalleri, Matteo, Hermann, Klaus, Guimond, S., Romanyshyn, Y., Kuhlenbeck, Helmut, Freund, Hans-Joachim
The identification of oxygen sites at metal oxide surfaces and the characterization of their properties is of great importance for an understanding of the catalytic activity of such materials and,...
Giordano, Livia, Pacchioni, Gianfranco, Goniakowski, Jacek, Nilius, Niklas, Rienks, Emile D. L., Freund, Hans-Joachim
Preparation and structure of alumina supported niobia model catalysts (2007)
Uhl, Alexander, Sainio, Jani, Lahtinen, Jouko, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Oxidation of alumina-supported Co and Co-Pd model catalysts for the Fischer-Tropsch reaction (2007)
Nowitzki, Tobias, Carlsson, Anders F., Martyanov, Oleg, Naschitzki, Matthias, Zielasek, Volmar, Risse, Thomas, ...
Cobalt and bimetallic Co-Pd systems are well-known Fischer-Tropsch catalysts. Compared to Co, the bimetallic systems exhibit an increased activity towards CO-hydrogenation and methane conversion,...
Schalow, Tobias, Brandt, Björn, Starr, David E., Laurin, Mathias, Shaikhutdinov, Shamil K., Schauermann, Swetlana, ...
Bäumer, Marcus, Libuda, Jörg, Neyman, Konstantin M., Rösch, Notker, Rupprechter, Günther, Freund, Hans-Joachim
González, Silvia, Neyman, Konstantin M., Shaikutdinov, Shamil, Freund, Hans-Joachim, Illas, Francesc
Lu, Jun-Ling, Weissenrieder, Jonas, Kaya, Sarp, Gao, Hong-Jun, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Nucleation and growth of gold on MgO thin films: A combined STM and luminescence study (2007)
Benia, Hadj Mohamed, Lin, Xiao, Gao, Hung-Jun, Nilius, Niklas, Freund, Hans-Joachim
Ice-assisted preparation of silica-supported vanadium oxide particles (2007)
Kaya, Sarp, Sun, Ying-Na, Weissenrieder, Jonas, Stacchiola, Dario, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Simic-Milosevic, Violeta, Heyde, Markus, Nilius, Niklas, Nowicki, Marek, Rust, Hans-Peter, Freund, Hans-Joachim
Surface metal-insulator transition on a vanadium pentoxide (001) single crystal (2007)
Blum, Ralf-Peter, Niehus, Horst, Hucho, Carsten, Fortrie, Rémy, Ganduglia-Pirovano, M. Véronica, Sauer, Joachim, ...
Oxygen adsorption on Mo(112) surface studied by ab initio genetic algorithm and experiment (2007)
Sierka, Marek, Todorova, Tanya K., Sauer, Joachim, Kaya, Sarp, Stacchiola, Dario, Weissenrieder, Jonas, ...
Molecular adsorption of V2O3(0001)/Au(111) surfaces (2007)
Bandara, Athula, Abu-Haija, Mohammad, Höbel, Frank, Kuhlenbeck, Helmut, Rupprechter, Günther, Freund, Hans-Joachim
Local zero-bias anomaly in tunneling spectra of a transition-metal oxide thin film (2007)
Rienks, Emile D. L., Nilius, Niklas, Giordano, Livia, Goniakowski, Jacek, Pacchioni, Gianfranco, Felicissimo, Marcella P., ...
Sterrer, Martin, Risse, Thomas, Giordano, Livia, Heyde, Markus, Nilius, Niklas, Rust, Hans-Peter, ...
Palladium monomers, dimers, and trimers on the MgO(001)surface - Viewed individually (2007)
Sterrer, Martin, Risse, Thomas, Giordano, Livia, Heyde, Markus, Nilius, Niklas, Rust, Hans-Peter, ...
Kaya, Sarp, Baron, Martin, Stacchiola, Dario, Weissenrieder, Jonas, Shaikhutdinov, Shamil, Todorova, Tanya K., ...
Heterogeneous catalysis on an atomic scale (2007)
Lu, Jun-Ling, Gao, Hong-Jun, Shi, Dong-Xia, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Characterization of a PdFe bimetallic model catalyst (2007)
Felicissimo, Marcella, Martyanov, Oleg N., Risse, Thomas, Freund, Hans-Joachim
Small bimetallic PdFe particles supported on well ordered alumina film grown on NiAl(110) were studied focusing on the geometric, electronic, adsorption, as well as magnetic properties. The...
Molecular adsorption on V2O3/(0001/Au(100) surfaces (2007)
Bandara, Athula, Abu Haija, Mohammad, Höbel, Frank, Kuhlenbeck, Helmut, Rupprechter, Günther, Freund, Hans-Joachim
X-ray spectroscopic fingerprints of reactive oxygen sites at the MoO3(010) surface (2007)
Cavalleri, Matteo, Hermann, Klaus, Guimond, Sebastien, Romanyshyn, Yuriy, Kuhlenbeck, Helmut, Freund, Hans-Joachim
Silvestre-Albero, Joaquin, Rupprechter, Guenther, Freund, Hans-Joachim
Although 1,3-butadiene hydrogenation is known to be a structure-sensitive reaction, correlation of the catalytic activity with the exact Pd particle surface structure shows that the reaction is in...
Identification of color centers on MgO(001) thin films with scanning tunneling microscopy (2006)
Sterrer, Martin, Heyde, Markus, Novicki, Marek, Nilius, Niklas, Risse, Thomas, Rust, Hans-Peter, ...
Localized electronic defects on the surface of a 4 monolayer (ML) thin MgO(001) film deposited on Ag(001) have been investigated by low-temperature scanning tunneling microscopy and spectroscopy....
Kulawik, Maria, Nilius, Niklas, Freund, Hans-Joachim
Thin oxide films grown on metal substrates are widely used in surface science to model bulk oxides, assuming their chemical and electronic properties to be similar. In some cases, however, this might...
Dittrich, Soeren, Freund, Hans-Joachim, Koch, Christiane P., Kosloff, Ronnie, Klüner, Thorsten
The photodesorption of NO from NiO(100) is studied from first principles, with electronic relaxation treated by the use of the surrogate Hamiltonian approach. Two nuclear degrees of freedom of the...
Di Valentin, Cristiana, Neyman, Konstantin M., Risse, Thomas, Sterrer, Martin, Fischbach, Esther, Freund, Hans-Joachim, ...
We report g tensors of surface color centers, so-called F-s(+) centers, of MgO calculated with two density-functional approaches using accurately embedded cluster models. In line with recent UHV...
Lear, Timothy, Marshall, Robert, Lopez-Sanchez, J. Antonio, Jackson, S. David, Klapötke, Thomas M., Bäumer, Marcus, ...
Erratum: The spectra presented in Fig. (a) have all been inadvertently shifted to high wavenumber, with respect to the wavenumber scale marked at the base of Fig. 5(b). No other part of the article...
Supported metal aggregates: Growth, structure and chemistry – PHYS 145 (2006)
PHYS 145 – Both the preparation of clean, well characterized oxide films as well as the understanding of nucleation and growth of metal nanoclusters are the basis for studies of chemical reactions...
Oxygen-induced restructuring of a Pd/Fe3O4 model catalyst (2006)
Schalow, Tobias, Brandt, Björn, Starr, David E., Laurin, Mathias, Schauermann, Swetlana, Shaikhutdinov, Shamil K., ...
We have studied the influence of oxygen on the structure and morphology of a Pd/Fe3O4 model catalyst using molecular beam (MB) methods, IR reflection absorption spectroscopy (IRAS) and scanning...
Bagus, Paul S., Wieckowski, Andrzej, Freund, Hans-Joachim
The validity of Auger parameter analyses to separate initial and final state contributions to core-level binding energy shifts in the growth of nanoparticles is tested; the specific concern is shifts...
Mehdaoui, Imed, Kröner, Dominik, Pykavy, Mikhail, Freund, Hans-Joachim, Klüner, Thorsten
The velocity distributions of the laser-induced desorption of NO molecules from an epitaxially grown film of NiO(100) on Ni(100) have been studied [Mull et al., J. Chem. Phys., 1992, 96, 7108]. A...
Silvestre-Albero, Joaquin, Rupprechter, Günther, Freund, Hans-Joachim
The selective hydrogenation of 1,3-butadiene was studied on a series of Pd/Al2O3/NiAl(110) model catalysts with mean Pd particle sizes of 2–8 nm. While Pd nanoparticles 4 nm exhibit a near...
Adsorption of water on thin V2O3(0001) films (2006)
Abu Haija, Mohammad, Guimond, Sebastien, Uhl, Alexander, Kuhlenbeck, Helmut, Freund, Hans-Joachim
V2O3(0001) films have been grown epitaxially on Au(111) and W(110). Under typical UHV conditions these films are terminated by a layer of vanadyl groups as has been shown previously [A.-C. Dupuis, M....
Low temperature adsorption of oxygen on reduced V2O3(0001) surfaces (2006)
Abu Haija, Mohammad, Guimond, Sebastien, Romanshyn, Yuriy, Uhl, Alexander, Kuhlenbeck, Helmut, Todorova, Tanya K., ...
Well ordered V2O3(0 0 0 1) films were prepared on Au(1 1 1) and W(1 1 0) substrates. These films are terminated by a layer of vanadyl groups under typical UHV conditions. Reduction by electron...
Höbel, Frank, Bandara, Athula, Rupprechter, Günther, Freund, Hans-Joachim
Structural changes that occur on Pd-Nb2O5/Cu3Au(100) model catalysts upon thermal annealing were followed by sum frequency generation (SFG) and temperature-programmed desorption (TPD) using CO as...
Binding of single gold atoms on thin MgO(001) films (2006)
Yulikov, Maxim, Sterrer, Martin, Heyde, Markus, Rust, Hans-Peter, Risse, Thomas, Freund, Hans-Joachim, ...
In the present Letter the first electron paramagnetic resonance spectra of single metal atoms on a single crystalline oxide surface are presented. For Au atoms on a MgO(001) film investigated here an...
Größenabhängiger Oxidationsmechanismus trägerfixierter Pd-Nanopartikel (2006)
Schalow, Tobias, Brandt, Björn, Starr, David E., Laurin, Mathias, Shaikhutdinov, Shamil K., Schauermann, Swetlana, ...
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Size-dependent oxidation mechanism of supported Pd nanoparticles (2006)
Schalow, Tobias, Brandt, Björn, Starr, David E., Laurin, Mathias, Shaikhutdinov, Shamil K., Schauermann, Swetlana, ...
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Wechselwirkung kleiner Au-Teilchen mit Farbzentren auf einkristallinen MgO(001)-Filmen (2006)
Sterrer, Martin, Yulikov, Maxim, Fischbach, Esther, Heyde, Markus, Rust, Hans-Peter, Pacchioni, Gianfranco, ...
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Interaction of gold clusters with color centers on MgO(001) films (2006)
Sterrer, Martin, Yulikov, Maxim, Fischbach, Esther, Heyde, Markus, Rust, Hans-Peter, Pacchioni, Gianfranco, ...
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Ungewöhnliches Schwingungsspektrum von CO auf Au1/MgO(001)/Mo(001): ein Effekt der Sonde (2006)
Sterrer, Martin, Yulikov, Maxim, Risse, Thomas, Freund, Hans-Joachim, Carrasco, Javier, Illas, Francesc, ...
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When the reporter induces the effect: Unusual IR spectra of CO on Au1/MgO(001)/Mo(001) (2006)
Sterrer, Martin, Yulikov, Maxim, Risse, Thomas, Freund, Hans-Joachim, Carrasco, Javier, Illas, Francesc, ...
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Rust, Hans-Peter, Heyde, Markus, Freund, Hans-Joachim
Signal electronics equipped with a bandpass filter phase detector for noncontact atomic force microscopy (ncAFM) has been developed. A double quartz tuning fork assembly is used as a force sensor,...
Acetylene and ethylene hydrogenation on alumina supported Pd–Ag model catalysts (2006)
Khan, Neetha A., Shaikhutdinov, Shamil K., Freund, Hans-Joachim
Adsorption and co-adsorption of ethylene, acetylene and hydrogen on Pd-Ag particles, supported on thin alumina films, have been studied by temperature programmed desorption (TPD). The TPD results...
Alumina supported model Pd–Ag catalysts: A combined STM, XPS, TPD and IRAS study (2006)
Khan, Neetha A., Uhl, Alexander, Shaikhutdinov, Shamil K., Freund, Hans-Joachim
The bimetallic Pd–Ag model catalysts were prepared by physical vapor deposition on thin alumina films. The morphology and structure of the Pd–Ag particles were studied by STM, XPS, and by TPD and...
Mendes, Fabiana M. T., Perez., C. A. C., Noronha, F. B., Souza, C. D. D., Cesar, D. V., Freund, Hans-Joachim, ...
A series of Co/x%Nb2O5/Al2O3 catalysts were prepared by anchoring niobia on an Al2O3 support at different niobia concentrations. Characterization of the structure and nature of surface active sites...
Sterrer, Martin, Fischbach, Esther, Heyde, Markus, Nilius, Niklas, Rust, Hans-Peter, Risse, Thomas, ...
The formation of surface color centers (FS centers) by electron bombardment of thin MgO(001) films is investigated using electron paramagnetic resonance and low-temperature scanning tunneling...
Heyde, Markus, Kulawik, Maria, Rust, Hans-Peter, Freund, Hans-Joachim
Force spectroscopy has been performed using a low-temperature scanning tunneling microscope (STM) and atomic force microscope (AFM) with small amplitude frequency modulation (FM). Frequency shift...
Heyde, Markus, Sterrer, Martin, Rust, Hans-Peter, Freund, Hans-Joachim
Atomically resolved images on a MgO(001) thin film deposited on Ag(001) obtained in ultrahigh vacuum by frequency modulated atomic force microscopy at low temperature are presented and analysed....
Sierka, Marek, Todorova, Tanya K., Kaya, Sarp, Stacchiola, Dario, Weissenrieder, Jonas, Lu, Junling, ...
The stability of ordered one- and two-dimensional silica structures formed on a Mo(112) surface as a function of silicon coverage and oxygen pressure (phase diagram) is derived from density...
CO adsorption on the surface of MgO(001) thin films (2006)
Sterrer, Martin, Risse, Thomas, Freund, Hans-Joachim
We report infrared reflection–absorption and thermal desorption spectra of CO adsorbed at low temperature (30 K) on the surface of MgO(001) thin films. The high similarity of the observed IR bands...
Effect of electromagnetic interactions on plasmon excitations in silver particle ensembles (2006)
Benia, Hadj-Mohamed, Nilius, Niklas, Freund, Hans-Joachim
The optical properties of silver nano-particle ensembles are studied as a function of particle density by analyzing the light emission excited via electron injection from an STM tip. The particles...
Di Valentin, Cristiana, Scagnelli, Andrea, Pacchioni, Gianfranco, Risse, Thomas, Freund, Hans-Joachim
Using all electron fully relativistic DFT calculations we have computed the EPR properties of Au atoms bound to various sites of the MgO surface. Changes in g-tensor and hyperfine coupling constants...
Influence of substrate morphology on organic layer growth: PTCDA on Ag(111) (2006)
Marchetto, Helder, Groh, Ullrich, Schmidt, Thomas, Fink, Rainer, Freund, Hans-Joachim, Umbach, Eberhard
By UV-excited photoelectron emission microscopy (UV-PEEM) we investigated the microscopic growth behavior of organic thin films using 3,4,9,10-perylene-tetracarboxylicacid dianhydride (PTCDA) on a...
Low temperature CO induced growth of Pd supported on a monolayer silica film (2006)
Lu, Junling, Kaya, Sarp, Weissenrieder, Jonas, Gao, Hongjun, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Nucleation, growth and sintering of Pd deposited on an ultra-thin silica film were studied by scanning tunneling microscopy and infrared reflection absorption spectroscopy. No preferential nucleation...
Formation of one-dimensional crystalline silica on a metal substrate (2006)
Lu, Junling, Kaya, Sarp, Weissenrieder, Jonas, Todorova, Tanya K., Sierka, Marek, Sauer, Joachim, ...
We have observed formation of one-dimensional silica structures of 0.5 nm in width on Mo(1 1 2) single crystal surface. Combination of high-resolution scanning tunneling microscopy, photoelectron and...
Oxygen-deficient line defects in an ultrathin aluminium oxide film (2006)
Schmid, Michael, Shishkin, Maxim, Kresse, Georg, Napetschnig, Evelyn, Varga, Peter, Kulawik, Maria, ...
A model for the straight antiphase domain boundary of the ultrathin aluminum oxide film on the NiAl(110) substrate is derived from scanning tunneling microscopy measurements and density-functional...
Vanadium oxide surfaces and supported vanadium oxide nanoparticles (2006)
Guimond, Sebastien, Abu Haija, Mohammad, Kaya, Sarp, Lu, Junling, Weissenrieder, Jonas, Shaikhutdinov, Shamil, ...
The information obtained from the characterization of vanadium oxide single crystal surfaces is related to the study of vanadia nanoparticles supported on silica and alumina thin films, model systems...
Formation of interface and surface oxides on supported Pd nanoparticles (2006)
Schalow, Tobias, Brandt, Björn, Laurin, Mathias, Schauermann, Swetlana, Guimond, Sebastien, Kuhlenbeck, Helmut, ...
We have quantitatively studied the interaction between oxygen and an Fe3O4-supported Pd model catalyst by molecular beam (MB) methods, time resolved IR reflection absorption spectroscopy (TR-IRAS)...
Photochemistry on metal nanoparticles (2006)
Watanabe, Kazuo, Menzel, Dietrich, Nilius, Niklas, Freund, Hans-Joachim
CO oxidation on partially oxidized Pd nanoparticles (2006)
Schalow, Tobias, Brandt, Björn, Laurin, Mathias, Schauermann, Swetlana, Libuda, Jörg, Freund, Hans-Joachim
Combining multi-molecular beam (MB) experiments and in situ time-resolved infrared reflection absorption spectroscopy (TR-IRAS), we studied the relationship between the formation of Pd surface oxides...
Carrasco, Javier, Lopez, Nuria, Illas, Francesc, Freund, Hans-Joachim
The neutral oxygen vacancy (OV) energy formation for bulk, subsurface sites at different depths from the surface and various surface sites has been estimated for single crystals, unsupported...
Strong metal support interaction on Co/niobia model catalysts (2006)
Mendes, Fabiana M. T., Uhl, Alexander, Starr, David E., Guimond, Sebastien, Schmal, Martin, Kuhlenbeck, Helmut, ...
Models for oxidation catalyst: Characterization and reaction at the atomic level (2006)
Three case studies to demonstrate the ability to characterize oxidation model catalysts and reactions of these systems at the atomic level are reviewed. Firstly, results on small Au aggregates on a...
Nilius, Niklas, Kulawik, Maria, Rust, Hans-Peter, Freund, Hans-Joachim
Refers to: Quantization of electronic states in individual oxide-supported silver particles, Surface Science, Volume 572, Issues 2-3, 20 November 2004, Pages 347-354 Niklas Nilius, Maria Kulawik,...
Morphology and optical properties of MgO thin films on Mo(001) (2006)
Benedetti, Stefania, Benia, Hadj-Mohamed, Nilius, Niklas, Valeri, Sergio, Freund, Hans-Joachim
Synthesis and structure of ultrathin aluminosilicate films (2006)
Stacchiola, Dario, Kaya, Sarp, Weissenrieder, Jonas, Kuhlenbeck, Helmut, Shaikhutdinov, Shamil K., Freund, Hans-Joachim, ...
Synthese und Struktur eines ultradünnen Alumosilicatfilms (2006)
Stacchiola, Dario, Kaya, Sarp, Weissenrieder, Jonas, Kuhlenbeck, Helmut, Shaikhutdinov, Shamil K., Freund, Hans-Joachim, ...
Probing adsorption sites on thin oxide films by dynamic force microscopy (2006)
Heyde, Markus, Simon, Georg H., Rust, Hans-Peter, Freund, Hans-Joachim
Evers,Florian, Rakete,Christoph, Watanabe,Kazuo, Menzel,Dietrich, Freund,Hans-Joachim
Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al2O3 film on NiAl(1 1 0) has been investigated using femtosecond lasers. The 2PPE spectra show a feature similar to the surface...
Borasio,Marta, De La Fuente,Oscar Rodriguez, Rupprechter,Günther, Freund,Hans-Joachim
Methanol decomposition and oxidation on Pd(111) at millibar pressure were studied by in situ polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS), on-line gas chromatography...
Heyde,Markus, Sterrer,Martin, Rust,Hans-Peter, Freund,Hans-Joachim
Atomic resolution with a double quartz tuning fork sensor for low-temperature ultrahigh vacuum atomic force and scanning tunneling microscopy is presented. The new features of the force sensor...
Weissenrieder,Jonas, Kaya,Sarp, Lu,Jun-Ling, Gao,Hong-Jun, Shaikhutdinov,Shamil, Freund,Hans-Joachim, ...
The structure of a thin single crystalline SiO2 film grown on Mo(112) has been studied by scanning tunneling microscopy, infrared reflection absorption spectroscopy, and x-ray photoelectron...
Self-organization of gold atoms on a polar FeO(111) surface (2005)
Nilius,Niklas, Rienks,Emile D. L., Rust,Hans-Peter, Freund,Hans-Joachim
The spatial distribution of single Au atoms on a thin FeO film has been investigated by low-temperature scanning tunneling microscopy and spectroscopy. The adatoms preferentially adsorb on distinct...
Morkel,Matthias, Unterhalt,Holger, Klüner,Thorsten, Freund,Hans-Joachim
The lineshape and intensity of SFG signals of CO adsorbed on supported Pd nanoparticles and Pd(111) are analyzed. For CO/Pd(111) nearly symmetric lorentzian lineshapes were observed. Applying two...
Photon emission spectroscopy of single oxide-supported Ag-Au alloy clusters (2005)
Benten,Wolfgang, Nilius,Niklas, Ernst,Norbert, Freund,Hans-Joachim
The alloying of Ag and Au has been investigated on the level of individual clusters by analyzing the light emission excited by electron injection from an STM tip. Different Ag-Au alloy and shell-core...
Sterrer,Martin, Fischbach,Esther, Risse,Thomas, Freund,Hans-Joachim
Electron paramagnetic resonance spectra of singly charged surface oxygen vacancies (F or color centers) formed by electron bombardment on a single-crystalline MgO film under UHV conditions are...
Model studies in heterogeneous catalysis. From structure to kinetics (2005)
Libuda,Jörg, Schauermann,Swetlana, Laurin,Mathias, Schalow,Tobias, Freund,Hans-Joachim
Heterogeneous catalysis is one of the fields of modern technology, where the application of complex inorganic materials is of enormous economical importance. For a long time, the chemical and...
Borasio, Marta, De La Fuente, Oscar Rodriguez, Rupprechter, Günther, Freund, Hans-Joachim
Methanol decomposition and oxidation on Pd(111) at millibar pressure were studied by in situ polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS), on-line gas chromatography...
Model studies in heterogeneous catalysis. From structure to kinetics (2005)
Libuda, Jörg, Schauermann, Swetlana, Laurin, Mathias, Schalow, Tobias, Freund, Hans-Joachim
Heterogeneous catalysis is one of the fields of modern technology, where the application of complex inorganic materials is of enormous economical importance. For a long time, the chemical and...
Self-organization of gold atoms on a polar FeO(111) surface (2005)
Nilius, Niklas, Rienks, Emile D. L., Rust, Hans-Peter, Freund, Hans-Joachim
The spatial distribution of single Au atoms on a thin FeO film has been investigated by low-temperature scanning tunneling microscopy and spectroscopy. The adatoms preferentially adsorb on distinct...
Weissenrieder, Jonas, Kaya, Sarp, Lu, Jun-Ling, Gao, Hong-Jun, Shaikhutdinov, Shamil, Freund, Hans-Joachim, ...
The structure of a thin single crystalline SiO2 film grown on Mo(112) has been studied by scanning tunneling microscopy, infrared reflection absorption spectroscopy, and x-ray photoelectron...
Heyde, Markus, Sterrer, Martin, Rust, Hans-Peter, Freund, Hans-Joachim
Atomic resolution with a double quartz tuning fork sensor for low-temperature ultrahigh vacuum atomic force and scanning tunneling microscopy is presented. The new features of the force sensor...
Morkel, Matthias, Unterhalt, Holger, Klüner, Thorsten, Freund, Hans-Joachim
The lineshape and intensity of SFG signals of CO adsorbed on supported Pd nanoparticles and Pd(111) are analyzed. For CO/Pd(111) nearly symmetric lorentzian lineshapes were observed. Applying two...
Sterrer, Martin, Fischbach, Esther, Risse, Thomas, Freund, Hans-Joachim
Electron paramagnetic resonance spectra of singly charged surface oxygen vacancies (F or color centers) formed by electron bombardment on a single-crystalline MgO film under UHV conditions are...
Evers, Florian, Rakete, Christoph, Watanabe, Kazuo, Menzel, Dietrich, Freund, Hans-Joachim
Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al2O3 film on NiAl(1 1 0) has been investigated using femtosecond lasers. The 2PPE spectra show a feature similar to the surface...
Photon emission spectroscopy of single oxide-supported Ag-Au alloy clusters (2005)
Benten, Wolfgang, Nilius, Niklas, Ernst, Norbert, Freund, Hans-Joachim
The alloying of Ag and Au has been investigated on the level of individual clusters by analyzing the light emission excited by electron injection from an STM tip. Different Ag-Au alloy and shell-core...
Laurin, Mathias, Johánek, Viktor, Grant, Ann W., Kasemo, Bengt, Libuda, Jörg, Freund, Hans-Joachim
Combining molecular beam methods and angular resolved mass spectrometry, we have studied the angular distribution of desorbing products during CO oxidation on a planar Pd/silica supported model...
Model studies on heterogeneous catalysts at the atomic level (2005)
Model studies carried out on ultrahigh vacuum (UHV) prepared nanoparticles grown on well-ordered oxide surfaces allow insight into structure and reactivity of such systems at the atomic level. We...
Ferryl (Fe=O) termination of the hematite α-Fe2O3(0001) surface (2005)
Lemire, Céline, Bertarione, Serena, Zecchina, Adriano, Scarano, Domenica, Chaka, Anne, Shaikhutdinov, Shamil, ...
Using scanning tunneling microscopy and infrared reflection absorption spectroscopy we have observed that the alpha-Fe2O3(0001) surface exhibits ferryl (Fe=O) groups, which may coexist with domains...
Heyde, Markus, Thielsch, Gero, Rust, Hans-Peter, Freund, Hans-Joachim
A new low temperature, ultrahigh vacuum cryostat design has been developed for atomic force and scanning tunnelling microscopy measurements. A microscope can be operated at 5 K in ultrahigh vacuum....
STM studies of ordered (√31x √31)R9° CO islands on Ag(111) (2005)
Kulawik, Maria, Rust, Hans-Peter, Nilius, Niklas, Heyde, Markus, Freund, Hans-Joachim
The adsorption behavior of CO on Ag(111) is studied using low-temperature scanning tunneling microscopy. At submonolayer coverage, only single CO molecules are observed upon adsorption at 5 K. A...
Finite size effects on supported Pd nanoparticles: Interaction of hydrogen with CO and C2H4 (2005)
Morkel, Matthias, Rupprechter, Günther, Freund, Hans-Joachim
Pd-hydride formation proceeds predominantly via minority sites on Pd nanoparticles (defects and (1 0 0) facets). Finite size effects govern the surface chemistry, e.g. “explosive” hydrogen...
Field electron energy spectroscopy of alumina-supported platinum adatoms (2005)
Cörper, Alexander, Bozdech, Georg, Ernst, Norbert, Klüner, Thorsten, Freund, Hans-Joachim
Field electron energy spectroscopy and density functional calculations have been employed to characterize electronic properties of single Pt-adatoms deposited on a thin alumina film. For...
Surface potential of a polar oxide film: FeO on Pt(111) (2005)
Rienks, Emile D. L., Nilius, Niklas, Rust, Hans-Peter, Freund, Hans-Joachim
We have studied a thin FeO film on Pt(111) using scanning tunneling microscopy. The corrugation of the Moiré pattern, that arises due to a lattice mismatch between the oxide film and the substrate,...
Reorganization of small Co particles on Al2O3 surfaces monitored by ferromagnetic resonance (2005)
Hill, Thomas, Risse, Thomas, Freund, Hans-Joachim
Changes of the magnetic properties of ferromagnetic Co particles deposited on the √31 x √31R±9° reconstructed α-Al2O3(0001) as well as on a thin alumina film grown on a NiAl(110) substrate...
Kaichev, Vasiliy V., Bukhtiyarov, Valerii I., Rupprechter, Günther, Freund, Hans-Joachim
An in situ study of the adsorption of CO on atomically smooth and defect Pd(111) surfaces was performed over wide ranges of temperatures (200-400 K) and pressures (10(-6)-1 mbar) by X-ray...
A model high surface area alumina-supported palladium catalyst (2005)
Lear, Timothy, Marshall, Robert, Gibson, Emma K., Schütt, Thomas, Klapötke, Thomas M., Rupprechter, Günther, ...
A catalyst preparative procedure is described that produces a high surface area alumina-supported palladium catalyst that yields an atypical chemisorbed carbon monoxide infrared spectrum. This...
Molecular beam experiments on model catalysts (2005)
Libuda, Jörg, Freund, Hans-Joachim
Heterogeneous catalysts are highly complex materials with respect to both their composition and structure. The reaction kinetics on their surfaces is known to depend sensitively on numerous...
CO adsorption and thermal stability of Pd deposited on a thin FeO(1 1 1) film (2005)
Meyer, Randall, Lahav, Doron, Schalow, Tobias, Laurin, Mathias, Brandt, Björn, Schauermann, Swetlana, ...
We have studied adsorption of CO on Pd deposited on a thin FeO(1 1 1) film grown on a Pt(1 1 1) substrate using temperature programmed desorption, infrared reflection absorption spectroscopy and...
Light emission spectroscopy of self-assembled arrays of silver nano-crystals with the STM (2005)
Nilius, Niklas, Benia, Hadj-Mohamed, Salzemann, Caroline, Rupprechter, Günther, Freund, Hans-Joachim, Brioude, Arnaud, ...
The optical properties of ordered and disordered assemblies of Ag nano-crystals on HOPG have been characterized by photon emission spectroscopy with the STM. The spectra reveal two emission maxima,...
Three-dimensional ab initio simulation of laser-induced desorption of NO from NiO(100) (2005)
Kröner, Dominik, Mehdaoui, Imed, Freund, Hans-Joachim, Klüner, Thorsten
Laser-induced desorption of NO molecules from a NiO(1 0 0) surface is studied on an ab initio level. Based on ab initio NiO-cluster calculations a three-dimensional potential energy surface was...
Interaction of CO molecules with surface state electrons on Ag(111) (2005)
Kulawik, Maria, Rust, Hans-Peter, Heyde, Markus, Nilius, Niklas, Mantooth, Brent A., Weiss, Paul S., ...
Like other close-packed noble metal surfaces, Ag(1 1 1) exhibits an occupied Shockley-type surface state that is believed to influence the adsorption of atoms and molecules. Using low-temperature...
Risse, Thomas, Freund, Hans-Joachim
A detailed knowledge of the microscopic properties is one of the prerequisites for an understanding of heterogeneous catalysts. A strategy which has proven to be valuable in this respect is the use...
Preparation and characterization of well-ordered, thin niobia films on a metal substrate (2005)
Starr, David E., Mendes, Fabiana M. T., Middeke, Jürgen, Blum, Ralf-Peter, Niehus, Horst, Lahav, Doron, ...
Combining low energy electron diffraction, scanning tunneling microscopy, angular resolved photoelectron spectroscopy using synchrotron radiation and density functional theory calculations, we have...
Gold supported on oxide surfaces: environmental effects as studied by STM (2005)
Starr, David E., Shaikhutdinov, Shamil K., Freund, Hans-Joachim
This paper begins by providing a short review of STM studies of gold particles supported on oxide surfaces. Following this, the morphology of Au particles deposited on thin FeO(111) films at elevated...
Low temperature infrared spectra of CO adsorbed on the surface of MgO(001) thin films (2005)
Sterrer, Martin, Risse, Thomas, Freund, Hans-Joachim
Reflection–absorption infrared spectra of CO adsorbed on the surface of thin MgO(0 0 1) films are reported in the temperature range 30–90 K. The observed bands are identical with those reported...
Silvestre-Albero, Joaquin, Rupprechter, Günther, Freund, Hans-Joachim
The selective hydrogenation of 1,3-butadiene on Pd(111) and Pd(110) model catalysts was studied at atmospheric pressure in the temperature range 298–373 K. In the initial stages of the reaction,...
Oxygen storage at the metal/oxide interface of catalyst nanoparticles (2005)
Schalow, Tobias, Laurin, Mathias, Brandt, Björn, Schauermann, Swetlana, Guimond, Sebastien, Kuhlenbeck, Helmut, ...
Lear, Timothy, Marshall, Robert, Lopez-Sanchez, J. Antonio, Jackson, S. David, Klapötke, Thomas M., Bäumer, Marcus, ...
Five alumina-supported palladium catalysts have been prepared from a range of precursor compounds [palladium(II) nitrate, palladium(II) chloride, palladium(II) acetylacetonate, and...
Laurin, Mathias, Johánek, Viktor, Grant, Ann W., Kasemo, Bengt, Libuda, Jörg, Freund, Hans-Joachim
Applying molecular-beam methods to a nanolithographically prepared planar Pd/SiO2 model catalyst, we have performed a detailed study of the kinetics of CO oxidation. The model catalyst was prepared...
Sauerstoffspeicherung an der Metall-Oxid-Grenzfläche von Katalysatornanopartikeln (2005)
Schalow, Tobias, Laurin, Mathias, Brandt, Björn, Schauermann, Swetlana, Guimond, Sebastien, Kuhlenbeck, Helmut, ...
Quantization of electronic states in individual oxide-supported silver particles (2004)
Nilius,Niklas, Kulawik,Maria, Rust,Hans-Peter, Freund,Hans-Joachim
The electronic properties of Ag particles on Al2O3/NiAl(1 1 0) have been investigated by low-temperature scanning tunnelling microscopy and spectroscopy. Conductance measurements on single clusters...
The surface structure of Fe3O4(111) films as studied by CO adsorption (2004)
Lemire,Céline, Meyer,Randall, Henrich,Victor E., Shaikhutdinov,Shamil, Freund,Hans-Joachim
We have studied adsorption of CO on Fe3O4(1 1 1) films grown on a Pt(1 1 1) substrate by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and high...
C–O bond scission on "defect-rich and perfect" Pd(111)? (2004)
Kaichev,Vasiliy V., Morkel,Matthias, Unterhalt,Holger, Prosvirin,Igor P., Bukhtiyarov,Valerii I., Rupprechter,Günther, ...
To investigate the influence of surface defects on CO adsorption and dissociation, well-annealed and "defect-rich" Pd(111) were examined by sum frequency generation (SFG) and X-ray photoelectron...
De La Fuente,Oscar Rodrígez, Borasio,Marta, Galletto,Paolo, Rupprechter,Günther, Freund,Hans-Joachim
Methanol adsorption/desorption and its time- and temperature-dependent decomposition on well-annealed and defect-rich (ion-bombarded) Pd(111) were examined by X-ray photoelectron spectroscopy (XPS)...
Morkel,Matthias, Kaichev,Vasiliy V., Rupprechter,Günther, Freund,Hans-Joachim, Prosvirin,Igor P., Bukhtiyarov,Valerii I.
Methanol decomposition on Pd(111) at 300 and 400 K was studied in situ from 5 _ 10-7 to 0.1 mbar by combining vibrational sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS)....
Magg,Norbert, Immaraporn,Boonchuan, Giorgi,Javier B., Schroeder,Thomas, Bäumer,Marcus, Döbler,Jens, ...
Oxide-supported vanadia particles were prepared via evaporation of vanadium metal in an oxygen ambient. As support oxides, we have employed thin, well-ordered alumina and silica films grown on top of...
Johánek,Viktor, Laurin,Mathias, Hoffmann,Jens, Schauermann,Swetlana, Grant,Ann W., Kasemo,Bengt, ...
Employing molecular beam methods, we have studied the angular distribution of products desorbing from oxide-supported Pd nanoparticles during catalytic oxidation of CO. A large range of particle...
Cluster core-level binding-energy shifts: the role of lattice strain (2004)
Richter,Bodo, Kuhlenbeck,Helmut, Freund,Hans-Joachim, Bagus,Paul S.
Our combined experimental and theoretical analysis of the shifts, with particle size, of core-level binding energies (BE's) of metal nanoparticles on insulating supports, shows that these shifts have...
CO adsorption study of V/SiO2: the low vanadium coverage regime (2004)
Immaraporn,Boonchuan, Magg,Norbert, Kaya,Sarp, Wang,Jia, Bäumer,Marcus, Freund,Hans-Joachim
Adsorption of CO and its isotopic mixtures on vanadium particles in the very low coverage growth regime (0.02–0.05 MLV) on an ultra-thin ordered silica film is monitored by IRAS at 60 K. At...
Heyde,Markus, Kulawik,Maria, Rust,Hans-Peter, Freund,Hans-Joachim
A double quartz tuning fork sensor for low temperature ultrahigh vacuum atomic force and scanning tunneling microscopy is presented. The features of the new sensor are discussed and compared to a...
Surface chemistry of catalysis by gold (2004)
Meyer,Randall, Lemire,Céline, Shaikhutdinov,Shamil K., Freund,Hans-Joachim
Gold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold...
Alkene chemistry on the palladium surface: nanoparticles vs single crystals (2004)
Doyle,Aidan M., Shaikhutdinov,Shamil K., Freund,Hans-Joachim
The adsorption of trans-2-pentene, cis-2-pentene, and 1-pentene on Pd(111) and Pd/Al2O3 model catalysts has been studied using temperature-programmed desorption (TPD). Each molecule reacts in an...
Bertarione,Serena, Scarano,Domenica, Zecchina,Adriano, Johánek,Viktor, Hoffmann,Jens, Schauermann,Swetlana, ...
A detailed comparative study of CH3OH adsorption on two categories of supported Palladium nanoparticles is reported: (1) MgO and gamma-Al2O3-supported Pd metal catalysts prepared by impregnation...
Rupprechter,Günther, Morkel,Matthias, Freund,Hans-Joachim, Hirschl,Robin
CO–H interaction and H bulk dissolution on Pd(1 1 1) were studied by sum frequency generation (SFG) vibrational spectroscopy and density functional theory (DFT). The theoretical findings are...
Magg,Norbert, Giorgi,Javier B., Frank,Martin M., Immaraporn,Boonchuan, Schroeder,Thomas, Bäumer,Marcus, ...
Alumina-supported vanadium particles were prepared under ultrahigh vacuum (UHV) conditions and characterized with respect to their structural and CO adsorption properties. As supporting oxide, we...
Lemire,Céline, Meyer,Randall, Shaikhutdinov,Shamil K., Freund,Hans-Joachim
CO adsorption on gold vapor-deposited on a thin FeO(1 1 1) film grown on a Pt(1 1 1) has been studied with temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy...
Formation of a faceted MoO2 epilayer on Mo(112) studied by XPS, UPS and STM (2004)
Schroeder,Thomas, Zegenhagen,Jörg, Magg,Norbert, Immaraporn,Boonchuan, Freund,Hans-Joachim
The open trough and row Mo(112) surface serves as substrate for the epitaxial growth of MoO2. XPS, UPS and STM studies of the oxygen adsorption allow to monitor step-by-step the transformation of the...
Defect-induced gap states in Al2O3 thin films on NiAl(110) (2004)
Nilius,Niklas, Kulawik,Maria, Rust,Hans-Peter, Freund,Hans-Joachim
The electronic properties of one-dimensional defects in ultrathin Al2O3 films have been investigated by low-temperature STM and STS. Whereas line defects between two oxide domains show almost no...
Bertarione,Serena, Scarano,Domenica, Zecchina,Adriano, Johánek,Viktor, Hoffmann,Jens, Schauermann,Swetlana, ...
To identify the nature and the local structure of the surface of supported catalyst nanoparticles, we have performed a detailed comparative study of CO adsorption on two categories of oxide-supported...
Structural changes in nanoparticle catalysts as monitored by their magnetic properties (2004)
Risse,Thomas, Mozaffari-Afshar,Mohsen, Hamann,Heiko, Freund,Hans-Joachim
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Borowski,Stefan, Klüner,Thorsten, Freund,Hans-Joachim, Klinkmann,I., Al-Shamery,Katharina, Pykavy,Mikhail, ...
Quantum state resolved determination of lateral velocity distributions in laser-induced desorption of CO from a Cr2O3(0001) surface is investigated. Experimentally, Doppler profiles are obtained via...
Do quantum size effects control CO adsorption on gold nanoparticles? (2004)
Lemire,Céline, Meyer,Randall, Shaikhutdinov,Shamil, Freund,Hans-Joachim
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Steuern Größenquantisierungseffekte die CO-Adsorption auf Au-Nanopartikeln? (2004)
Lemire,Céline, Meyer,Randall, Shaikhutdinov,Shamil, Freund,Hans-Joachim
Johánek,Viktor, Schauermann,Swetlana, Laurin,Mathias, Gopinath,Chinnakonda S., Libuda,Jörg, Freund,Hans-Joachim
We have studied the catalytic decomposition of NO on a structurally well-defined Pd model catalyst, employing a combination of molecular beam techniques and time-resolved IR reflection absorption...
CO oxidation on a Pd/Fe3O4(111) model catalyst (2004)
Meyer,Randall, Shaikhutdinov,Shamil K., Freund,Hans-Joachim
Adsorption of CO and O2 on Pd particles deposited on a well-ordered Fe3O4(111) film was studied by temperature programmed desorption. Scanning tunneling microscopy was used to provide structural...
Bertarione, Serena, Scarano, Domenica, Zecchina, Adriano, Johánek, Viktor, Hoffmann, Jens, Schauermann, Swetlana, ...
A detailed comparative study of CH3OH adsorption on two categories of supported Palladium nanoparticles is reported: (1) MgO and gamma-Al2O3-supported Pd metal catalysts prepared by impregnation...
Borowski, Stefan, Klüner, Thorsten, Freund, Hans-Joachim, Klinkmann, I., Al-Shamery, Katharina, Pykavy, Mikhail, ...
Quantum state resolved determination of lateral velocity distributions in laser-induced desorption of CO from a Cr2O3(0001) surface is investigated. Experimentally, Doppler profiles are obtained via...
Do quantum size effects control CO adsorption on gold nanoparticles? (2004)
Lemire, Céline, Meyer, Randall, Shaikhutdinov, Shamil, Freund, Hans-Joachim
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Magg, Norbert, Giorgi, Javier B., Frank, Martin M., Immaraporn, Boonchuan, Schroeder, Thomas, Bäumer, Marcus, ...
Alumina-supported vanadium particles were prepared under ultrahigh vacuum (UHV) conditions and characterized with respect to their structural and CO adsorption properties. As supporting oxide, we...
Alkene chemistry on the palladium surface: nanoparticles vs single crystals (2004)
Doyle, Aidan M., Shaikhutdinov, Shamil K., Freund, Hans-Joachim
The adsorption of trans-2-pentene, cis-2-pentene, and 1-pentene on Pd(111) and Pd/Al2O3 model catalysts has been studied using temperature-programmed desorption (TPD). Each molecule reacts in an...
Heyde, Markus, Kulawik, Maria, Rust, Hans-Peter, Freund, Hans-Joachim
A double quartz tuning fork sensor for low temperature ultrahigh vacuum atomic force and scanning tunneling microscopy is presented. The features of the new sensor are discussed and compared to a...
CO adsorption study of V/SiO2: the low vanadium coverage regime (2004)
Immaraporn, Boonchuan, Magg, Norbert, Kaya, Sarp, Wang, Jia, Bäumer, Marcus, Freund, Hans-Joachim
Adsorption of CO and its isotopic mixtures on vanadium particles in the very low coverage growth regime (0.02–0.05 MLV) on an ultra-thin ordered silica film is monitored by IRAS at 60 K. At...
Johánek, Viktor, Laurin, Mathias, Hoffmann, Jens, Schauermann, Swetlana, Grant, Ann W., Kasemo, Bengt, ...
Employing molecular beam methods, we have studied the angular distribution of products desorbing from oxide-supported Pd nanoparticles during catalytic oxidation of CO. A large range of particle...
Johánek, Viktor, Schauermann, Swetlana, Laurin, Mathias, Gopinath, Chinnakonda S., Libuda, Jörg, Freund, Hans-Joachim
We have studied the catalytic decomposition of NO on a structurally well-defined Pd model catalyst, employing a combination of molecular beam techniques and time-resolved IR reflection absorption...
C–O bond scission on "defect-rich and perfect" Pd(111)? (2004)
Kaichev, Vasiliy V., Morkel, Matthias, Unterhalt, Holger, Prosvirin, Igor P., Bukhtiyarov, Valerii I., Rupprechter, Günther, ...
To investigate the influence of surface defects on CO adsorption and dissociation, well-annealed and "defect-rich" Pd(111) were examined by sum frequency generation (SFG) and X-ray photoelectron...
Bertarione, Serena, Scarano, Domenica, Zecchina, Adriano, Johánek, Viktor, Hoffmann, Jens, Schauermann, Swetlana, ...
To identify the nature and the local structure of the surface of supported catalyst nanoparticles, we have performed a detailed comparative study of CO adsorption on two categories of oxide-supported...
Steuern Größenquantisierungseffekte die CO-Adsorption auf Au-Nanopartikeln? (2004)
Lemire, Céline, Meyer, Randall, Shaikhutdinov, Shamil, Freund, Hans-Joachim
Lemire, Céline, Meyer, Randall, Shaikhutdinov, Shamil K., Freund, Hans-Joachim
CO adsorption on gold vapor-deposited on a thin FeO(1 1 1) film grown on a Pt(1 1 1) has been studied with temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy...
The surface structure of Fe3O4(111) films as studied by CO adsorption (2004)
Lemire, Céline, Meyer, Randall, Henrich, Victor E., Shaikhutdinov, Shamil, Freund, Hans-Joachim
We have studied adsorption of CO on Fe3O4(1 1 1) films grown on a Pt(1 1 1) substrate by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and high...
Magg, Norbert, Immaraporn, Boonchuan, Giorgi, Javier B., Schroeder, Thomas, Bäumer, Marcus, Döbler, Jens, ...
Oxide-supported vanadia particles were prepared via evaporation of vanadium metal in an oxygen ambient. As support oxides, we have employed thin, well-ordered alumina and silica films grown on top of...
Surface chemistry of catalysis by gold (2004)
Meyer, Randall, Lemire, Céline, Shaikhutdinov, Shamil K., Freund, Hans-Joachim
Gold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold...
CO oxidation on a Pd/Fe3O4(111) model catalyst (2004)
Meyer, Randall, Shaikhutdinov, Shamil K., Freund, Hans-Joachim
Adsorption of CO and O2 on Pd particles deposited on a well-ordered Fe3O4(111) film was studied by temperature programmed desorption. Scanning tunneling microscopy was used to provide structural...
Morkel, Matthias, Kaichev, Vasiliy V., Rupprechter, Günther, Freund, Hans-Joachim, Prosvirin, Igor P., Bukhtiyarov, Valerii I.
Methanol decomposition on Pd(111) at 300 and 400 K was studied in situ from 5 _ 10-7 to 0.1 mbar by combining vibrational sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS)....
Defect-induced gap states in Al2O3 thin films on NiAl(110) (2004)
Nilius, Niklas, Kulawik, Maria, Rust, Hans-Peter, Freund, Hans-Joachim
The electronic properties of one-dimensional defects in ultrathin Al2O3 films have been investigated by low-temperature STM and STS. Whereas line defects between two oxide domains show almost no...
Quantization of electronic states in individual oxide-supported silver particles (2004)
Nilius, Niklas, Kulawik, Maria, Rust, Hans-Peter, Freund, Hans-Joachim
The electronic properties of Ag particles on Al2O3/NiAl(1 1 0) have been investigated by low-temperature scanning tunnelling microscopy and spectroscopy. Conductance measurements on single clusters...
Cluster core-level binding-energy shifts: the role of lattice strain (2004)
Richter, Bodo, Kuhlenbeck, Helmut, Freund, Hans-Joachim, Bagus, Paul S.
Our combined experimental and theoretical analysis of the shifts, with particle size, of core-level binding energies (BE's) of metal nanoparticles on insulating supports, shows that these shifts have...
Structural changes in nanoparticle catalysts as monitored by their magnetic properties (2004)
Risse, Thomas, Mozaffari-Afshar, Mohsen, Hamann, Heiko, Freund, Hans-Joachim
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De La Fuente, Oscar Rodrígez, Borasio, Marta, Galletto, Paolo, Rupprechter, Günther, Freund, Hans-Joachim
Methanol adsorption/desorption and its time- and temperature-dependent decomposition on well-annealed and defect-rich (ion-bombarded) Pd(111) were examined by X-ray photoelectron spectroscopy (XPS)...
Rupprechter, Günther, Morkel, Matthias, Freund, Hans-Joachim, Hirschl, Robin
CO–H interaction and H bulk dissolution on Pd(1 1 1) were studied by sum frequency generation (SFG) vibrational spectroscopy and density functional theory (DFT). The theoretical findings are...
Formation of a faceted MoO2 epilayer on Mo(112) studied by XPS, UPS and STM (2004)
Schroeder, Thomas, Zegenhagen, Jörg, Magg, Norbert, Immaraporn, Boonchuan, Freund, Hans-Joachim
The open trough and row Mo(112) surface serves as substrate for the epitaxial growth of MoO2. XPS, UPS and STM studies of the oxygen adsorption allow to monitor step-by-step the transformation of the...
Adsorption and reaction on deposited nanoparticles – COLL 341 (2004)
We report results on CO, H2, C2H4 and CH3OH adsorption and reaction on Pd nanoparticles deposited on an alumina film. Molecular beam studies in combination with FTIR investigations have been used to...
Model catalyst studies on Fischer-Tropsch materials – PETR 74 (2004)
Bimetallic Co–Pd Fischer-Tropsch catalysts have shown increased activity toward CO-hydrogenation and methane conversion. A model for these Fischer-Tropsch catalysts has been constructed and studied...
Mayer,Ralf W., Melzer,Mario, Hävecker,Michael, Knop-Gericke,Axel, Urban,Joachim, Freund,Hans-Joachim, ...
Mayer,Ralf W., Melzer,Mario, Hävecker,Michael, Knop-Gericke,Axel, Urban,Joachim, Freund,Hans-Joachim, ...
Hydrogenation on metal surfaces: Why are nanoparticles more active than single crystals? (2003)
Doyle,Aidan M., Shaikhutdinov,Shamil K., Jackson,S. David, Freund,Hans-Joachim
Using IR intensities as a probe for studying the surface chemical bond (2003)
Risse,Thomas, Carlsson,Anders, Bäumer,Marcus, Klüner,Thorsten, Freund,Hans-Joachim
V2O3(0001) on Au(111) and W(110): growth, termination and electronic structure (2003)
Dupuis,Anne-Claire, Abu Al-Haija,Mohammed, Richter,Bodo, Kuhlenbeck,Helmut, Freund,Hans-Joachim
Low temperature decomposition of NO on ordered alumina films (2003)
Schauermann,Swetlana, Johánek,Viktor, Laurin,Matthias, Libuda,Jörg, Freund,Hans-Joachim
Cluster, facets, and edges: site-dependent selective chemistry on model catalysts (2003)
Freund,Hans-Joachim, Libuda,Jörg, Bäumer,Marcus, Risse,Thomas, Carlsson,Anders F.
Atomic structure of antiphase domain boundaries of a thin Al2O3 film on NiAl(110) (2003)
Kulawik,Maria, Nilius,Niklas, Rust,Hans-Peter, Freund,Hans-Joachim
Hydrierung an Metalloberflächen: Warum sind Nanoteilchen aktiver als Einkristalle? (2003)
Doyle,Aidan M., Shaikhutdinov,Shamil K., Jackson,S. David, Freund,Hans-Joachim
Kulawik,Maria, Nowicki,Marek, Thielsch,Gero, Cramer,Ludger, Rust,Hans-Peter, Freund,Hans-Joachim, ...
Magg,Norbert, Giorgi,Javier B., Hammoudeh,Ayman, Schroeder,Thomas, Bäumer,Marcus, Freund,Hans-Joachim
Shaikhutdinov,Shamil K., Meyer,Randall, Lahav,Doron, Bäumer,Marcus, Klüner,Thorsten, Freund,Hans-Joachim
Size and support effects for CO adsorption on gold model catalysts (2003)
Shaikhutdinov,Shamil K., Meyer,Randall, Naschitzki,Matthias, Bäumer,Marcus, Freund,Hans-Joachim
Ultra-thin zeolite films prepared by spin-coating Silicalite-1 precursor solutions (2003)
Doyle,Aidan, Rupprechter,Günther, Pfänder,Norbert, Schlögl,Robert, Kirschhock,Christine E. A., Martens,Johan A., ...
Freund,Hans-Joachim, Bäumer,Marcus, Libuda,Jörg, Risse,Thomas, Rupprechter,Günther, Shaikhutdinov,Shamil
On the thermal stability of metal particles supported on a thin alumina film (2003)
Heemeier,Michael, Stempel,Sascha, Shaikhutdinov,Shamil, Libuda,Jörg, Bäumer,Marcus, Oldman,Richard J., ...
Kaichev,Vasiliy V., Prosvirin,Igor P., Bukhtiyarov,Valerii I., Unterhalt,Holger, Rupprechter,Günther, Freund,Hans-Joachim
Rupprechter,Günther, Unterhalt,Holger, Morkel,Matthias, Galletto,Paolo, Dellwig,Thilo, Freund,Hans-Joachim
Mayer,Ralf W., Melzer,Mario, Hävecker,Michael, Knop-Gericke,Axel, Urban,Joachim, Freund,Hans-Joachim, ...
Interaction of NO with alumina supported palladium model catalysts (2003)
Schauermann,Swetlana, Johánek,Viktor, Laurin,Mathias, Libuda,Jörg, Freund,Hans-Joachim
CO adsorption on Pd nanoparticles: density functional and vibrational spectroscopy studies (2003)
Yudanov,Ilya V., Sahnoun,Riadh, Neyman,Konstantin M., Rösch,Notker, Hoffmann,Jens, Schauermann,Swetlana, ...
Mayer, Ralf W., Melzer, Mario, Hävecker, Michael, Knop-Gericke, Axel, Urban, Joachim, Freund, Hans-Joachim, ...
Mayer, Ralf W., Melzer, Mario, Hävecker, Michael, Knop-Gericke, Axel, Urban, Joachim, Freund, Hans-Joachim, ...
Freund, Hans-Joachim, Rupprechter, Günther, Bäumer, Marcus, Risse, Thomas, Ernst, Norbert, Libuda, Jörg
Hydrogenation on metal surfaces: Why are nanoparticles more active than single crystals? (2003)
Doyle, Aidan M., Shaikhutdinov, Shamil K., Jackson, S. David, Freund, Hans-Joachim
Using IR intensities as a probe for studying the surface chemical bond (2003)
Risse, Thomas, Carlsson, Anders, Bäumer, Marcus, Klüner, Thorsten, Freund, Hans-Joachim
V2O3(0001) on Au(111) and W(110): growth, termination and electronic structure (2003)
Dupuis, Anne-Claire, Richter, Bodo, Kuhlenbeck, Helmut, Freund, Hans-Joachim
Low temperature decomposition of NO on ordered alumina films (2003)
Schauermann, Swetlana, Johánek, Viktor, Laurin, Matthias, Libuda, Jörg, Freund, Hans-Joachim
Cluster, facets, and edges: site-dependent selective chemistry on model catalysts (2003)
Freund, Hans-Joachim, Libuda, Jörg, Bäumer, Marcus, Risse, Thomas, Carlsson, Anders F.
Atomic structure of antiphase domain boundaries of a thin Al2O3 film on NiAl(110) (2003)
Kulawik, Maria, Nilius, Niklas, Rust, Hans-Peter, Freund, Hans-Joachim
Hydrierung an Metalloberflächen: Warum sind Nanoteilchen aktiver als Einkristalle? (2003)
Doyle, Aidan M., Shaikhutdinov, Shamil K., Jackson, S. David, Freund, Hans-Joachim
Kulawik, Maria, Nowicki, Marek, Thielsch, Gero, Cramer, Ludger, Rust, Hans-Peter, Freund, Hans-Joachim, ...
Magg, Norbert, Giorgi, Javier B., Hammoudeh, Ayman, Schroeder, Thomas, Bäumer, Marcus, Freund, Hans-Joachim
Shaikhutdinov, Shamil K., Meyer, Randall, Lahav, Doron, Bäumer, Marcus, Klüner, Thorsten, Freund, Hans-Joachim
Size and support effects for CO adsorption on gold model catalysts (2003)
Shaikhutdinov, Shamil K., Meyer, Randall, Naschitzki, Matthias, Bäumer, Marcus, Freund, Hans-Joachim
Ultra-thin zeolite films prepared by spin-coating Silicalite-1 precursor solutions (2003)
Doyle, Aidan, Rupprechter, Günther, Pfänder, Norbert, Schlögl, Robert, Kirschhock, Christine E. A., Martens, Johan A., ...
Freund, Hans-Joachim, Bäumer, Marcus, Libuda, Jörg, Risse, Thomas, Rupprechter, Günther, Shaikhutdinov, Shamil
On the thermal stability of metal particles supported on a thin alumina film (2003)
Heemeier, Michael, Stempel, Sascha, Shaikhutdinov, Shamil, Libuda, Jörg, Bäumer, Marcus, Oldman, Richard J., ...
Kaichev, Vasiliy V., Prosvirin, Igor P., Bukhtiyarov, Valerii I., Unterhalt, Holger, Rupprechter, Günther, Freund, Hans-Joachim
Rupprechter, Günther, Unterhalt, Holger, Morkel, Matthias, Galletto, Paolo, Dellwig, Thilo, Freund, Hans-Joachim
Mayer, Ralf W., Melzer, Mario, Hävecker, Michael, Knop-Gericke, Axel, Urban, Joachim, Freund, Hans-Joachim, ...
Interaction of NO with alumina supported palladium model catalysts (2003)
Schauermann, Swetlana, Johánek, Viktor, Laurin, Mathias, Libuda, Jörg, Freund, Hans-Joachim
CO adsorption on Pd nanoparticles: density functional and vibrational spectroscopy studies (2003)
Yudanov, Ilya V., Sahnoun, Riadh, Neyman, Konstantin M., Rösch, Notker, Hoffmann, Jens, Schauermann, Swetlana, ...
Heemeier,Michael, Carlsson,Anders F., Naschitzki,Matthias, Schmal,Martin, Bäumer,Marcus, Freund,Hans-Joachim
–
Heemeier,Michael, Carlsson,Anders F., Naschitzki,Matthias, Schmal,Martin, Bäumer,Marcus, Freund,Hans-Joachim
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Schroeder,Thomas, Giorgi,Javier B., Bäumer,Marcus, Freund,Hans-Joachim
Ultrathin crystalline silica layers grown on a Mo(112) substrate have been shown to be a useful silica model oxide support in surface science model catalyst studies. As the oxide support material...
Rovibrational preexcitation in the photodesorption of CO from Cr2O3 (2002)
Thiel,Stephan, Klüner,Thorsten, Lemoine,Didier, Freund,Hans-Joachim
The influence of rovibrational preexcitation in the CO/Cr2O3(0 0 0 1)-system is studied theoretically using a three-dimensional quantum wave packet approach. We find that selectively excited hindered...
Model systems for heterogeneous catalysis: Quo vadis surface science? (2002)
Freund,Hans-Joachim, Ernst,Norbert, Bäumer,Marcus, Rupprechter,Günther, Libuda,Jörg, Kuhlenbeck,Helmut, ...
Magg,Norbert, Giorgi,Javier B., Schroeder,Thomas, Bäumer,Marcus, Freund,Hans-Joachim
A model system of alumina-supported vanadia particles, representing catalysts of the type oxide(1)/oxide(2), was prepared under ultrahigh vacuum (UHV) conditions and characterized regarding its...
Preparation of vanadium and vanadium oxide clusters by means of inert gas aggregation (2002)
Melzer,Mano, Urban,Joachim, Sack-Kongehl,Hilde, Weiss,Klaus, Freund,Hans-Joachim, Schlögl,Robert
Vanadium clusters were prepared by the inert gas aggregation technique by evaporating V of high purity. Structural characterization was performed by high-resolution transmission electron microscopy....
Structure sensitivity of CO dissociation on Rh surfaces (2002)
Mavrikakis,M., Bäumer,Marcus, Freund,Hans-Joachim, Norskov,Jens K.
Using periodic self-consistent density functional calculations it is shown that the barrier for CO dissociation is similar to120 kJ/mol lower on the stepped Rh(211) surface than on the close-packed...
Catalytic activity and poisoning of specific sites on supported metal nanoparticles (2002)
Schauermann,Swetlana, Hoffmann,Jens, Johánek,Viktor, Hartmann,Jens, Libuda,Jörg, Freund,Hans-Joachim
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Schauermann,Swetlana, Hoffmann,Jens, Johánek,Viktor, Hartmann,Jens, Libuda,Jörg, Freund,Hans-Joachim
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Palladium deposits on a single crystalline Cr2O3(0001) surface (2002)
Wolter,Kai, Kuhlenbeck,Helmut, Freund,Hans-Joachim
Palladium deposits on a single crystalline Cr2O3(0001) film grown on Cr(110) have been studied under ultrahigh vacuum conditions. The growth mode at two different temperatures (90 and 300 K) was...
Characterization of a model Ziegler-Natta catalyst for ethylene polymerization (2002)
Schmidt,Jörg, Risse,Thomas, Hamann,Heiko, Freund,Hans-Joachim
Based on the work of the Somorjai group [Magni and Somorjai, Catal. Lett. 35, 205 (1995)] we have prepared a thin well ordered MgCl2(001) film by MgCl2 evaporation from a Knudsen cell. This film does...
Ceballos,Gustavo, Song,Zhen, Pascual,José Ignacio, Rust,Hans-Peter, Bäumer,Marcus, Freund,Hans-Joachim
A thin Al2O3 layer grown on NiAl(110) has been studied by scanning tunneling microscopy at about 4 K. The film exhibited monocrystalline ordering compatible with the (111) face of gamma-alumina with...
Ceballos,Gustavo, Song,Zhen, Pascual,Jose I., Rust,Hans-Peter, Conrad,Horst, Bäumer,Marcus, ...
A thin Al2O3 layer grown on NiAl(110) has been studied by scanning tunneling microscopy at about 4 K. The film exhibited monocrystalline ordering compatible with the (111) face of -alumina with a...
Effect of carbon deposits on reactivity of supported Pd model catalysts (2002)
Shaikhutdinov,Shamil K., Frank,Martin, Bäumer,Marcus, Jackson,S. David, Oldman,Richard J., Hemminger,John C., ...
Alumina-supported Pd model catalysts were prepared by Pd evaporation onto a thin alumina film grown on a NiAl(110) substrate. Adsorption and co-adsorption of ethene, CO and hydrogen on...
Reaction kinetics on complex model catalysts under single scattering conditions (2002)
Libuda,Jörg, Freund,Hans-Joachim
To approach a microscopic understanding of the reaction kinetics on complex surfaces of heterogeneous catalysts, we combine multimolecular beam techniques and a supported model catalyst approach. The...
Direkte Beobachtung von Radikalen bei der Aktivierung von Ziegler-Natta-Katalysatoren (2002)
Risse,Thomas, Schmidt,Jörg, Hamann,Heiko, Freund,Hans-Joachim
CO2 adsorption on Na precovered Cr2O3(0001) (2002)
Seiferth,Oliver, Wolter,Kai, Kuhlenbeck,Helmut, Freund,Hans-Joachim
CO2 adsorption and reaction on Cr2O3(0001) is considerably modified by the presence of Na on the surface. Depending on Na coverage, different modes of interaction and reaction have been observed. At...
Rupprechter,Günther, Unterhalt,Holger, Morkel,Matthias, Galletto,Paolo, Hu,Linjie, Freund,Hans-Joachim
Carbon monoxide adsorption on Pd(111) and Pd nanoparticles supported by Al2O3/NiAl(110) was examined by vibrational sum frequency generation spectroscopy from 10(-8) to 1000 mbar, and from 100 to 400...
Interaction of oxygen with palladium deposited on a thin alumina film (2002)
Shaikhutdinov,Shamil, Heemeier,Michael, Hoffmann,Jens, Meusel,Ingo, Richter,B., Bäumer,Marcus, ...
The interaction of oxygen with Pd particles. vapor deposited onto a thin alumina film grown on a NiAl(110) substrate. was studied by STM. AES, LEED, XPS. TPD and molecular beam techniques. The...
Nanofacet-resolved CO oxidation kinetics on alumina- supported Pd particles (2002)
Hoffmann,Jens, Schauermann,Swetlana, Hartmann,Jens, Zhdanov,Vladimir P., Kasemo,Bengt, Libuda,Jörg, ...
Employing a multi-molecular-beam approach, we have measured the angular distribution of CO, molecules formed during CO oxidation under steady-state conditions on well oriented and shaped nm-sized Pd...
Oxygen-induced p(2x3) reconstruction on Mo(112) studied by LEED and STM (2002)
Schroeder,Thomas, Giorgi,Javier B., Hammoudeh,Ayman, Magg,Norbert, Bäumer,Marcus, Freund,Hans-Joachim
The open trough-and-row Mo(112) surface serves as substrate for the epitaxial growth of MoO2. In the early stage of oxygen exposure, oxygen chemisorption induces a p(2x3) surface reconstruction of...
Tip influence on plasmon excitations in single gold particles in an STM (2002)
Nilius,Niklas, Ernst,Norbert, Freund,Hans-Joachim
Photon-emission spectra have been measured for individual titania-supported gold particles excited by the electron current from an STM tip. Depending on the interaction strength between tip and...
Cathodoluminescence of small silver particles on Al2O3/NiAl (110) (2002)
Drachsel,Wolfgang, Adelt,M., Nilius,Niklas, Freund,Hans-Joachim
Cathodoluminescence experiments have been performed on silver clusters, which were grown on well characterized Al2O3 films supported on (110) NiAl crystals. Cluster size and shape were varied via Ag...
Borowski,Stefan, Thiel,Stephan, Klüner,Thorsten, Freund,Hans-Joachim, Tisma,Reinhard, Lederer,Hermann
We present a massively parallel implementation to perform quantum dynamical wave packet calculations of molecules on surfaces. The employed algorithm propagates the wavefunction via the...
Study of CO adsorption on crystalline-silica-supported palladium particles (2002)
Giorgi,Javier B., Schroeder,Thomas, Bäumer,Marcus, Freund,Hans-Joachim
Supported palladium particles have been studied using a recently developed crystalline silica film. The SiO2 film, as seen for the first time by scanning tunnelling microscopy (STM), is sufficiently...
Unterhalt,Holger, Rupprechter,Günther, Freund,Hans-Joachim
The adsorption of CO on Pd(I 11) and on Al2O3-supported Id nanoparticles was studied by picosecond infrared-visible sum frequency generation (SFG) vibrational spectroscopy in a pressure range from...
Thiel,Stephan, Pykavy,Mikhail, Klüner,Thorsten, Freund,Hans-Joachim, Kosloff,Ronnie, Staemmler,Volker
In recent experiments, the rotational alignment of the laser induced nonthermal desorption of CO adsorbed on an epitaxially grown film of Cr2O3(0001) has been studied [Beauport, Al-Shamery, and...
Adsorption of molecular and atomic hydrogen on vacuum-cleaved V2O5(001) (2002)
Tepper,Bettina, Richter,Bodo, Dupuis,Anne-Claire, Kuhlenbeck,Helmut, Hucho,Carsten, Schilbe,Peter, ...
The (001) surface of a vacuum-cleaved V2O5 single crystal has been studied using high-resolution electron energy loss spectroscopy (HREELS), UV-photoelectron spectroscopy angular resolved...
Rotational preexcitation in the photodesorption of CO from Cr2O3 (2002)
Thiel,Stephan, Klüner,Thorsten, Freund,Hans-Joachim, Lemoine,Didier
Rupprechter,Günther, Unterhalt,Holger, Morkel,Matthias, Galletto,Paolo, Hu,Linjie, Freund,Hans-Joachim
Direct observation of radicals in the activation of Ziegler-Natta catalysts (2002)
Risse,Thomas, Schmidt,Jörg, Hamann,Heiko, Freund,Hans-Joachim
Kampling,Margarethe, Al-Shamery,Katharina, Freund,Hans-Joachim, Wilde,Markus, Fukutani,Katsuyuki, Murata,Yoshitada
UV-laser induced desorption of NO from nanostructured palladium aggregates on an epitaxial alumina support has been studied by means of resonance enhanced multiphoton ionisation (REMPI) to detect...
Electron, photon and thermally induced chemistry in alkali-NO coadsorbates on oxide surfaces (2002)
Bender,M., Seiferth,O., Carley,A. F., Chambers,A., Freund,Hans-Joachim, Roberts,M. W.
The molecular origins of selectivity in methanol decomposition on Pd nanoparticles (2002)
Schauermann,Swetlana, Hoffmann,Jens, Johánek,Viktor, Hartmann,Jens, Libuda,Jörg, Freund,Hans-Joachim
Ceballos, Gustavo, Song, Zhen, Pascual, José Ignacio, Rust, Hans-Peter, Bäumer, Marcus, Freund, Hans-Joachim
A thin Al2O3 layer grown on NiAl(110) has been studied by scanning tunneling microscopy at about 4 K. The film exhibited monocrystalline ordering compatible with the (111) face of gamma-alumina with...
Effect of carbon deposits on reactivity of supported Pd model catalysts (2002)
Shaikhutdinov, Shamil K., Frank, Martin, Bäumer, Marcus, Jackson, S. David, Oldman, Richard J., Hemminger, John C., ...
Alumina-supported Pd model catalysts were prepared by Pd evaporation onto a thin alumina film grown on a NiAl(110) substrate. Adsorption and co-adsorption of ethene, CO and hydrogen on...
Borowski, Stefan, Thiel, Stephan, Klüner, Thorsten, Freund, Hans-Joachim, Tisma, Reinhard, Lederer, Hermann
We present a massively parallel implementation to perform quantum dynamical wave packet calculations of molecules on surfaces. The employed algorithm propagates the wavefunction via the...
Oxygen-induced p(2x3) reconstruction on Mo(112) studied by LEED and STM (2002)
Schroeder, Thomas, Giorgi, Javier B., Hammoudeh, Ayman, Magg, Norbert, Bäumer, Marcus, Freund, Hans-Joachim
The open trough-and-row Mo(112) surface serves as substrate for the epitaxial growth of MoO2. In the early stage of oxygen exposure, oxygen chemisorption induces a p(2x3) surface reconstruction of...
Thiel, Stephan, Pykavy, Mikhail, Klüner, Thorsten, Freund, Hans-Joachim, Kosloff, Ronnie, Staemmler, Volker
In recent experiments, the rotational alignment of the laser induced nonthermal desorption of CO adsorbed on an epitaxially grown film of Cr2O3(0001) has been studied [Beauport, Al-Shamery, and...
Rotational preexcitation in the photodesorption of CO from Cr2O3 (2002)
Thiel, Stephan, Klüner, Thorsten, Freund, Hans-Joachim, Lemoine, Didier
Rupprechter, Günther, Unterhalt, Holger, Morkel, Matthias, Galletto, Paolo, Hu, Linjie, Freund, Hans-Joachim
Model systems for heterogeneous catalysis: Quo vadis surface science? (2002)
Freund, Hans-Joachim, Ernst, Norbert, Bäumer, Marcus, Rupprechter, Günther, Libuda, Jörg, Kuhlenbeck, Helmut, ...
Study of CO adsorption on crystalline-silica-supported palladium particles (2002)
Giorgi, Javier B., Schroeder, Thomas, Bäumer, Marcus, Freund, Hans-Joachim
Supported palladium particles have been studied using a recently developed crystalline silica film. The SiO2 film, as seen for the first time by scanning tunnelling microscopy (STM), is sufficiently...
Cathodoluminescence of small silver particles on Al2O3/NiAl (110) (2002)
Drachsel, Wolfgang, Adelt, M., Nilius, Niklas, Freund, Hans-Joachim
Cathodoluminescence experiments have been performed on silver clusters, which were grown on well characterized Al2O3 films supported on (110) NiAl crystals. Cluster size and shape were varied via Ag...
Tip influence on plasmon excitations in single gold particles in an STM (2002)
Nilius, Niklas, Ernst, Norbert, Freund, Hans-Joachim
Photon-emission spectra have been measured for individual titania-supported gold particles excited by the electron current from an STM tip. Depending on the interaction strength between tip and...
Unterhalt, Holger, Rupprechter, Günther, Freund, Hans-Joachim
The adsorption of CO on Pd(I 11) and on Al2O3-supported Id nanoparticles was studied by picosecond infrared-visible sum frequency generation (SFG) vibrational spectroscopy in a pressure range from...
Adsorption of molecular and atomic hydrogen on vacuum-cleaved V2O5(001) (2002)
Tepper, Bettina, Richter, Bodo, Dupuis, Anne-Claire, Kuhlenbeck, Helmut, Hucho, Carsten, Schilbe, Peter, ...
The (001) surface of a vacuum-cleaved V2O5 single crystal has been studied using high-resolution electron energy loss spectroscopy (HREELS), UV-photoelectron spectroscopy angular resolved...
Nanofacet-resolved CO oxidation kinetics on alumina- supported Pd particles (2002)
Hoffmann, Jens, Schauermann, Swetlana, Hartmann, Jens, Zhdanov, Vladimir P., Kasemo, Bengt, Libuda, Jörg, ...
Employing a multi-molecular-beam approach, we have measured the angular distribution of CO, molecules formed during CO oxidation under steady-state conditions on well oriented and shaped nm-sized Pd...
Interaction of oxygen with palladium deposited on a thin alumina film (2002)
Shaikhutdinov, Shamil, Heemeier, Michael, Hoffmann, Jens, Meusel, Ingo, Richter, B., Bäumer, Marcus, ...
The interaction of oxygen with Pd particles. vapor deposited onto a thin alumina film grown on a NiAl(110) substrate. was studied by STM. AES, LEED, XPS. TPD and molecular beam techniques. The...
Clusters and islands on oxides: from catalysis via electronics and magnetism to optics (2002)
The study of metal deposits on oxides represents a field of wide interest with respect to applications as well as to basic science. The state of the art of the field is reviewed on the basis of...
Rupprechter, Günther, Unterhalt, Holger, Morkel, Matthias, Galletto, Paolo, Hu, Linjie, Freund, Hans-Joachim
Carbon monoxide adsorption on Pd(111) and Pd nanoparticles supported by Al2O3/NiAl(110) was examined by vibrational sum frequency generation spectroscopy from 10(-8) to 1000 mbar, and from 100 to 400...
Direct observation of radicals in the activation of Ziegler-Natta catalysts (2002)
Risse, Thomas, Schmidt, Jörg, Hamann, Heiko, Freund, Hans-Joachim
Direkte Beobachtung von Radikalen bei der Aktivierung von Ziegler-Natta-Katalysatoren (2002)
Risse, Thomas, Schmidt, Jörg, Hamann, Heiko, Freund, Hans-Joachim
Reaction kinetics on complex model catalysts under single scattering conditions (2002)
Libuda, Jörg, Freund, Hans-Joachim
To approach a microscopic understanding of the reaction kinetics on complex surfaces of heterogeneous catalysts, we combine multimolecular beam techniques and a supported model catalyst approach. The...
CO2 adsorption on Na precovered Cr2O3(0001) (2002)
Seiferth, Oliver, Wolter, Kai, Kuhlenbeck, Helmut, Freund, Hans-Joachim
CO2 adsorption and reaction on Cr2O3(0001) is considerably modified by the presence of Na on the surface. Depending on Na coverage, different modes of interaction and reaction have been observed. At...
Characterization of a model Ziegler-Natta catalyst for ethylene polymerization (2002)
Schmidt, Jörg, Risse, Thomas, Hamann, Heiko, Freund, Hans-Joachim
Based on the work of the Somorjai group [Magni and Somorjai, Catal. Lett. 35, 205 (1995)] we have prepared a thin well ordered MgCl2(001) film by MgCl2 evaporation from a Knudsen cell. This film does...
Ceballos, Gustavo, Song, Zhen, Pascual, Jose I., Rust, Hans-Peter, Conrad, Horst, Bäumer, Marcus, ...
A thin Al2O3 layer grown on NiAl(110) has been studied by scanning tunneling microscopy at about 4 K. The film exhibited monocrystalline ordering compatible with the (111) face of -alumina with a...
Kampling, Margarethe, Al-Shamery, Katharina, Freund, Hans-Joachim, Wilde, Markus, Fukutani, Katsuyuki, Murata, Yoshitada
UV-laser induced desorption of NO from nanostructured palladium aggregates on an epitaxial alumina support has been studied by means of resonance enhanced multiphoton ionisation (REMPI) to detect...
Palladium deposits on a single crystalline Cr2O3(0001) surface (2002)
Wolter, Kai, Kuhlenbeck, Helmut, Freund, Hans-Joachim
Palladium deposits on a single crystalline Cr2O3(0001) film grown on Cr(110) have been studied under ultrahigh vacuum conditions. The growth mode at two different temperatures (90 and 300 K) was...
Preparation of vanadium and vanadium oxide clusters by means of inert gas aggregation (2002)
Melzer, Mano, Urban, Joachim, Sack-Kongehl, Hilde, Weiss, Klaus, Freund, Hans-Joachim, Schlögl, Robert
Vanadium clusters were prepared by the inert gas aggregation technique by evaporating V of high purity. Structural characterization was performed by high-resolution transmission electron microscopy....
Structure sensitivity of CO dissociation on Rh surfaces (2002)
Mavrikakis, M., Bäumer, Marcus, Freund, Hans-Joachim, Norskov, Jens K.
Using periodic self-consistent density functional calculations it is shown that the barrier for CO dissociation is similar to120 kJ/mol lower on the stepped Rh(211) surface than on the close-packed...
Catalytic activity and poisoning of specific sites on supported metal nanoparticles (2002)
Schauermann, Swetlana, Hoffmann, Jens, Johánek, Viktor, Hartmann, Jens, Libuda, Jörg, Freund, Hans-Joachim
–
Magg, Norbert, Giorgi, Javier B., Schroeder, Thomas, Bäumer, Marcus, Freund, Hans-Joachim
A model system of alumina-supported vanadia particles, representing catalysts of the type oxide(1)/oxide(2), was prepared under ultrahigh vacuum (UHV) conditions and characterized regarding its...
Rovibrational preexcitation in the photodesorption of CO from Cr2O3 (2002)
Thiel, Stephan, Klüner, Thorsten, Lemoine, Didier, Freund, Hans-Joachim
The influence of rovibrational preexcitation in the CO/Cr2O3(0 0 0 1)-system is studied theoretically using a three-dimensional quantum wave packet approach. We find that selectively excited hindered...
Heemeier, Michael, Carlsson, Anders F., Naschitzki, Matthias, Schmal, Martin, Bäumer, Marcus, Freund, Hans-Joachim
–
Heemeier, Michael, Carlsson, Anders F., Naschitzki, Matthias, Schmal, Martin, Bäumer, Marcus, Freund, Hans-Joachim
–
Schauermann, Swetlana, Hoffmann, Jens, Johánek, Viktor, Hartmann, Jens, Libuda, Jörg, Freund, Hans-Joachim
–
Schroeder, Thomas, Giorgi, Javier B., Bäumer, Marcus, Freund, Hans-Joachim
Ultrathin crystalline silica layers grown on a Mo(112) substrate have been shown to be a useful silica model oxide support in surface science model catalyst studies. As the oxide support material...
Electron, photon and thermally induced chemistry in alkali-NO coadsorbates on oxide surfaces (2002)
Bender, M., Seiferth, O., Carley, A. F., Chambers, A., Freund, Hans-Joachim, Roberts, M. W.
The molecular origins of selectivity in methanol decomposition on Pd nanoparticles (2002)
Schauermann, Swetlana, Hoffmann, Jens, Johánek, Viktor, Hartmann, Jens, Libuda, Jörg, Freund, Hans-Joachim
Schubert, Torsten, Volkmann, J., Müller, Ulrich, Sturm, V., Voges, J., Freund, Hans-Joachim, ...
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The cerebral oscillatory network of parkinsonian resting tremor (2002)
Timmermann, Lars, Gross, Joachim, Dirks, Martin, Volkmann, Jens, Freund, Hans-Joachim, Schnitzler, Alfons
Data from experiments in MPTP monkeys as well as from invasive and non‐invasive recordings in patients with Parkinson’s disease suggest an abnormal synchronization of neuronal activity in the...
Sum frequency generation study of CO adsorption on palladium model catalysts (2001)
Unterhalt,Holger, Galletto,Paolo, Morkel,Matthias, Rupprechter,Günther, Freund,Hans-Joachim
In the present contribution CO adsorption on palladium aggregates was examined with IR-visible sum frequency generation vibrational spectroscopy Supported Pd nanoparticles of different mean size and...
Sum frequency generation study of CO adsorption on palladium model catalysts (2001)
Unterhalt, Holger, Galletto, Paolo, Morkel, Matthias, Rupprechter, Günther, Freund, Hans-Joachim
In the present contribution CO adsorption on palladium aggregates was examined with IR-visible sum frequency generation vibrational spectroscopy Supported Pd nanoparticles of different mean size and...
Adsorption and reaction of ethene on oxide-supported Pd, Rh and Ir particles. (2001)
Frank, Martin, Bäumer, Marcus, Kühnemuth, Ralf, Freund, Hans-Joachim
Models in heterogeneous catalysis: Surface science quo vadis? (2001)
Freund, Hans-Joachim, Ernst, Norbert, Risse, Thomas, Hamann, Heiko, Rupprechter, Günther
Freund, Hans-Joachim, Kuhlenbeck, Helmut, Libuda, Jörg, Rupprechter, Günther, Bäumer, Marcus, Hamann, Heiko
Molecules on well-structured oxide surfaces. (2001)
Woodruff, David P., Freund, Hans-Joachim, Kuhlenbeck, Helmut, Risse, Thomas
The interaction of oxygen with alumina-supported palladium particles. (2001)
Meusel, Ingo, Hoffmann, Jens, Hartmann, Jens, Heemeier, Michael, Bäumer, Marcus, Libuda, Jörg, ...
Experiments on individual alumina-supported adatoms and clusters. (2001)
Nilius, Niklas, Cörper, Alexander, Bozdech, Georg, Ernst, Norbert, Freund, Hans-Joachim
Neuromagnetic correlates of sensorimotor synchronization (2000)
Müller, Katharina, Schmitz, Frank, Schnitzler, Alfons, Freund, Hans-Joachim, Aschersleben, Gisa, Prinz, Wolfgang
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Weiss, Peter H., Marshall, John C., Wunderlich, Gilbert, Tellmann, Lutz, Halligan, Peter W., Freund, Hans-Joachim, ...
We used PET to determine which brain regions are implicated when normal volunteers bisect horizontal lines and point to dots in near (peripersonal) or far (extrapersonal) space. Studies of line...
Metal-oxide interaction for metal clusters on a metal-supported thin alumina film (1999)
Andersson,Staffan, Brühwiler,Paul A., Sandell,Anders, Frank,M., Libuda,Jörg, Giertz,A., ...
The interaction between deposited metal clusters and a thin model alumina film grown on NiAl(110) have been studied using X-ray absorption spectroscopy (XAS) and core and valence photoelectron...
Hermann, Klaus, Witko, Malgorzata, Druzinic, Rok, Chakrabarti, Aparna, Tepper, Bettina, Elsner, M., ...
Metal-oxide interaction for metal clusters on a metal-supported thin alumina film (1999)
Andersson, Staffan, Brühwiler, Paul A., Sandell, Anders, Frank, M., Libuda, Jörg, Giertz, A., ...
The interaction between deposited metal clusters and a thin model alumina film grown on NiAl(110) have been studied using X-ray absorption spectroscopy (XAS) and core and valence photoelectron...
Müller, Katharina, Schmitz, Frank, Aschersleben, Gisa, Schnitzler, Alfons, Freund, Hans-Joachim, Prinz, Wolfgang
The influence of accoustik feedback on bimanual tapping (1999)
Müller, Katharina, Aschersleben, Gisa, Schmitz, Frank, Schnitzler, Alfons, Freund, Hans-Joachim, Prinz, Wolfgang
Modality-dependent source activations during a sensorimotor synchronization-task (1999)
Müller, Katharina, Schmitz, Frank, Aschersleben, Gisa, Schnitzler, Alfons, Freund, Hans-Joachim, Prinz, Wolfgang
Concept and design of the SMART spectromicroscope at BESSY II (1998)
Engel,W., Degenhardt,Ralf, Bradshaw,Alexander M., Erlebach,Wolfgang, Ihmann,Klaus, Kuhlenbeck,Helmut, ...
Concept and design of the SMART spectromicroscope at BESSY II (1998)
Engel, W., Degenhardt, Ralf, Bradshaw, Alexander M., Erlebach, Wolfgang, Ihmann, Klaus, Kuhlenbeck, Helmut, ...
SENSORIMOTOR DISTURBANCES IN PATIENTS WITH LESIONS OF THE PARIETAL CORTEX (1989)
PAUSE, MAX, KUNESCH, ERWIN, BINKOFSKI, FERDINAND, FREUND, HANS-JOACHIM
Somatosensory and motor disturbances of hand function were examined in 9 patients with parietal lobe lesions. A quantitative score was used for the elaboration of sensorimotor profiles displaying the...
IMPAIRMENT OF RAPID MOVEMENT IN HUNTINGTON'S DISEASE (1987)
HEFTER, HARALD, HÖMBERG, VOLKER, LANGE, HERWIG W., FREUND, HANS-JOACHIM
Patients with Huntington's disease (HD) and relatives at risk were examined with respect to their capacity to produce rapid voluntary motor activity. For this purpose, the fastest possible self-paced...
LESIONS OF PREMOTOR CORTEX IN MAN (1985)
FREUND, HANS-JOACHIM, HUMMELSHEIM, HORST
Moderate unilateral weakness of shoulder and hip muscles and limb-kinetic apraxia were observed in 11 patients with frontal lobe lesions on the side opposite to the neurological deficits. On the CT...
Dick, Bernhard, Freund, Hans-Joachim, Hohlneicher, Georg
CI-calcns. based on an extended CNDO formalism, were used to analyze the low lying excited states of Ni(CO)4 and Fe(CO)5. At. d -> s and d -> p excitations are important in the low energy region....
Nürnberg, H. f. Wirtsch.- u. Sozialwiss., Diss. v. 11. Mai 1955 (Nicht f. d. Aust.).
Strong metal support interaction of Co/niobia model catalysts
Mendes, Fabiana M. T., Uhl, Alexander, Starr, David E., Guimond, Sebastien, Schmal, Martin, Kuhlenbeck, Helmut, ...
Müller, Katharina, Aschersleben, Gisa, Schmitz, Frank, Schnitzler, Alfons, Freund, Hans-Joachim, Prinz, Wolfgang
Although the temporal occurrence of the pacing signal is predictable in sensorimotor synchronization tasks, normal subjects perform on-the-beat-tapping to an isochronous auditory metronome with an...