Low frequency Raman studies of multi-wall carbon nanotubes: experiments and theory (2002)
Benoit, J. M., Buisson, J. P., Chauvet, O., Godon, C., Lefrant, S.
In this paper, we investigate the low frequency Raman spectra of multi-wall carbon nanotubes (MWNT) prepared by the electric arc method. Low frequency Raman modes are unambiguously identified on...
20 Years of ’Synthetic Metals‘ - the role of Synthesis. (1999)
Bernier, P., Lefrant, S., Bidan, G., Marsitzky, D., Müllen, Klaus
Lapkowski, M, Kiebooms, R, Pron, A, Louarn, G, Lefrant, S, GELAN, Jan, ...
Poly(2,5-dithienylene-isothianaphthene) and its analogue, deutered on the benzene ring, have been prepared by voltammetric polymerization of the corresponding monomers in Bu4NBF4/acetonitrile...
Lapkowski, M, Kiebooms, R, Pron, A, Louarn, G, Lefrant, S, GELAN, Jan, ...
Poly(2,5-dithienylene-isothianaphthene) and its analogue, deutered on the benzene ring, have been prepared by voltammetric polymerization of the corresponding monomers in Bu4NBF4/acetonitrile...
Lapkowski, M, Kiebooms, R, Pron, A, Nguyen, TP, Louarn, G, Lefrant, S, ...
A new method for the preparation of poly(isothianaphthene) is proposed, namely electropolymerisation of bis(tert-butyldimethylsilyl)isothianaphthene (BTBDMS)ITN. The advantage offered by this method...
Preparation of poly(isothianaphthene) from 2,5-bis(trialkylsilyl)isothianaphthenes (1997)
Lapkowski, M, Kiebooms, R, Pron, A, Chauvet, O, Lefrant, S, VANDERZANDE, Dirk
It is demonstrated that thee anodic oxidation of 2,5-bis(tert-butyldimethylsilyl) isothianaphthene in Bu4NBF4/nitrobenzene electrolyte results in the formation of poly( isothianaphthene) film with an...
Lapkowski, M, Kiebooms, R, Pron, A, Nguyen, TP, Louarn, G, Lefrant, S, ...
A new method for the preparation of poly(isothianaphthene) is proposed, namely electropolymerisation of bis(tert-butyldimethylsilyl)isothianaphthene (BTBDMS)ITN. The advantage offered by this method...
Preparation of poly(isothianaphthene) from 2,5-bis(trialkylsilyl)isothianaphthenes (1997)
Lapkowski, M, Kiebooms, R, Pron, A, Chauvet, O, Lefrant, S, VANDERZANDE, Dirk
It is demonstrated that thee anodic oxidation of 2,5-bis(tert-butyldimethylsilyl) isothianaphthene in Bu4NBF4/nitrobenzene electrolyte results in the formation of poly( isothianaphthene) film with an...
Auban-Senzier, P., Bourbonnais, C., Jérome, D., Lenoir, C., Batail, P., Canadell, E., ...
We have performed the simultaneous investigation of the isotope effect on the superconducting transition and on the Raman spectra in the organic superconductor βH-(BEDT-TTF)2I3 (Tc = 8 K). For...
Transport properties of conducting polythiophene-polystyrene composites (1993)
Samir, F., Morsli, M., Bonnet, A., Conan, A., Lefrant, S.
Experimental results on electrical conductivity and thermoelectric power for (FeCl3 - doped polythiophene) - polystyrene composites have been performed in the temperature range 77 - 300 K and with...
Auban-Senzier, P., Bourbonnais, C., Jérome, D., Lenoir, C., Batail, P., Canadell, E., ...
We have performed the simultaneous investigation of the isotope effect on the superconducting transition and on the Raman spectra in the organic superconductor βH-(BEDT-TTF)2I3 (Tc = 8 K). For...
Transport properties of conducting polythiophene-polystyrene composites (1993)
Samir, F., Morsli, M., Bonnet, A., Conan, A., Lefrant, S.
Experimental results on electrical conductivity and thermoelectric power for (FeCl3 - doped polythiophene) - polystyrene composites have been performed in the temperature range 77 - 300 K and with...
Auban-Senzier, P., Bourbonnais, C., Jérome, D., Lenoir, C., Batail, P., Canadell, E., ...
We have performed the simultaneous investigation of the isotope effect on the superconducting transition and on the Raman spectra in the organic superconductor βH-(BEDT-TTF)2I3 (Tc = 8 K). For...
Transport properties of conducting polythiophene-polystyrene composites (1993)
Samir, F., Morsli, M., Bonnet, A., Conan, A., Lefrant, S.
Experimental results on electrical conductivity and thermoelectric power for (FeCl3 - doped polythiophene) - polystyrene composites have been performed in the temperature range 77 - 300 K and with...
Oxygen vibrations in the series Bi2Sr2Can-1CunO4+2n+y (1991)
Faulques, E., Dupouy, P., Lefrant, S.
We present a discussion of the oxygen vibrations in the Bi2Sr2Can-1CunO4+2n+y high Tc superconductors with the aim of interpreting Raman spectra in the case of the non-symmorphic Amaa structure....
Oxygen vibrations in the series Bi2Sr2Can-1CunO4+2n+y (1991)
Faulques, E., Dupouy, P., Lefrant, S.
We present a discussion of the oxygen vibrations in the Bi2Sr2Can-1CunO4+2n+y high Tc superconductors with the aim of interpreting Raman spectra in the case of the non-symmorphic Amaa structure....
Oxygen vibrations in the series Bi2Sr2Can-1CunO4+2n+y (1991)
Faulques, E., Dupouy, P., Lefrant, S.
We present a discussion of the oxygen vibrations in the Bi2Sr2Can-1CunO4+2n+y high Tc superconductors with the aim of interpreting Raman spectra in the case of the non-symmorphic Amaa structure....
DOPAGE ET DEGRADATION DU POLYACETYLENE PAR L'ACIDE NITRIQUE (1983)
Billaud, D., Haleem, M., Lefrant, S., Krichene, S.
L'action de HNO3 vapeur sur le trans-polyacétylène conduit d'une part à la formation d'un complexe de transfert de charge et d'autre part à une dégradation causée par la rupture des doubles...
Billaud, D., Kulszewicz, I., Pro_, A., Bernier, P., Lefrant, S.
Some new metal halides (InCl3, InI3, TiCl4, TiI4, SnCl4, ZrCl4) can oxidize polyacetylene with the formation of highly conducting polymers characterized by elemental analysis, mass uptake and...
N-TYPE DOPING OF (CH)x : MOLECULAR DIFFUSION OF THE DOPANT (1983)
Rachdi, F., Bernier, P., Faulques, E., Lefrant, S., Schué, F.
We have studied the kinetics of the n-type doping of cis-(CH)x films using Lithium-benzophenone solutions in THF. Raman spectroscopy shows that cis-trans isomerization occurs during the doping...
RAMAN SCATTERING INDUCED BY UNDOPED AND DOPED POLYPARAPHENYLENE (1983)
Krichene, S., Lefrant, S., Froyer, G., Maurice, F., Pelous, Y.
Raman scattering results on polyparaphenylene samples prepared by two different methods are presented. The best spectra are obtained with an excitation wavelength in the U.V. range and the Raman...
RAMAN STUDY OF DOPED POLYACETYLENES (1983)
We present Raman scattering results obtained on doped polyacetylene films, using a variety of dopants including electron acceptors (I2, Br2, SbF5, ClO4-, FeCl3) and electron donors (Li for example)....
RESONANCE RAMAN SCATTERING INDUCED BY POLYACETYLENE AND DERIVATIVES (1983)
In this paper, we recall the main results obtained in Raman scattering on polyacetylene (CH)x, cis or trans, and we concentrate on the experimental point of view. New results are presented,...
The thermal isomerization of polyacetylene studied by Raman scattering (1983)
A study of the thermal isomerization of cis-(CH)x films has been carried out by means of Raman scattering spectroscopy. It is found that the Raman band profiles, induced by trans-(CH)x films, are...
Vibrational analysis of trans-polyacetylene : (CH)x and (CD)x (1983)
Jumeau, D., Lefrant, S., Faulques, E., Buisson, J.P.
We have calculated the normal modes « in the plane » of a trans-polyacetylene chain (CH)x, using a model with twelve force constants. When x is infinite, the Born cyclic condition allows us to...
DOPAGE ET DEGRADATION DU POLYACETYLENE PAR L'ACIDE NITRIQUE (1983)
Billaud, D., Haleem, M., Lefrant, S., Krichene, S.
L'action de HNO3 vapeur sur le trans-polyacétylène conduit d'une part à la formation d'un complexe de transfert de charge et d'autre part à une dégradation causée par la rupture des doubles...
Billaud, D., Kulszewicz, I., Pro_, A., Bernier, P., Lefrant, S.
Some new metal halides (InCl3, InI3, TiCl4, TiI4, SnCl4, ZrCl4) can oxidize polyacetylene with the formation of highly conducting polymers characterized by elemental analysis, mass uptake and...
N-TYPE DOPING OF (CH)x : MOLECULAR DIFFUSION OF THE DOPANT (1983)
Rachdi, F., Bernier, P., Faulques, E., Lefrant, S., Schué, F.
We have studied the kinetics of the n-type doping of cis-(CH)x films using Lithium-benzophenone solutions in THF. Raman spectroscopy shows that cis-trans isomerization occurs during the doping...
RAMAN SCATTERING INDUCED BY UNDOPED AND DOPED POLYPARAPHENYLENE (1983)
Krichene, S., Lefrant, S., Froyer, G., Maurice, F., Pelous, Y.
Raman scattering results on polyparaphenylene samples prepared by two different methods are presented. The best spectra are obtained with an excitation wavelength in the U.V. range and the Raman...
RAMAN STUDY OF DOPED POLYACETYLENES (1983)
We present Raman scattering results obtained on doped polyacetylene films, using a variety of dopants including electron acceptors (I2, Br2, SbF5, ClO4-, FeCl3) and electron donors (Li for example)....
RESONANCE RAMAN SCATTERING INDUCED BY POLYACETYLENE AND DERIVATIVES (1983)
In this paper, we recall the main results obtained in Raman scattering on polyacetylene (CH)x, cis or trans, and we concentrate on the experimental point of view. New results are presented,...
The thermal isomerization of polyacetylene studied by Raman scattering (1983)
A study of the thermal isomerization of cis-(CH)x films has been carried out by means of Raman scattering spectroscopy. It is found that the Raman band profiles, induced by trans-(CH)x films, are...
Vibrational analysis of trans-polyacetylene : (CH)x and (CD)x (1983)
Jumeau, D., Lefrant, S., Faulques, E., Buisson, J.P.
We have calculated the normal modes « in the plane » of a trans-polyacetylene chain (CH)x, using a model with twelve force constants. When x is infinite, the Born cyclic condition allows us to...
DOPAGE ET DEGRADATION DU POLYACETYLENE PAR L'ACIDE NITRIQUE (1983)
Billaud, D., Haleem, M., Lefrant, S., Krichene, S.
L'action de HNO3 vapeur sur le trans-polyacétylène conduit d'une part à la formation d'un complexe de transfert de charge et d'autre part à une dégradation causée par la rupture des doubles...
Billaud, D., Kulszewicz, I., Pro_, A., Bernier, P., Lefrant, S.
Some new metal halides (InCl3, InI3, TiCl4, TiI4, SnCl4, ZrCl4) can oxidize polyacetylene with the formation of highly conducting polymers characterized by elemental analysis, mass uptake and...
N-TYPE DOPING OF (CH)x : MOLECULAR DIFFUSION OF THE DOPANT (1983)
Rachdi, F., Bernier, P., Faulques, E., Lefrant, S., Schué, F.
We have studied the kinetics of the n-type doping of cis-(CH)x films using Lithium-benzophenone solutions in THF. Raman spectroscopy shows that cis-trans isomerization occurs during the doping...
RAMAN SCATTERING INDUCED BY UNDOPED AND DOPED POLYPARAPHENYLENE (1983)
Krichene, S., Lefrant, S., Froyer, G., Maurice, F., Pelous, Y.
Raman scattering results on polyparaphenylene samples prepared by two different methods are presented. The best spectra are obtained with an excitation wavelength in the U.V. range and the Raman...
RAMAN STUDY OF DOPED POLYACETYLENES (1983)
We present Raman scattering results obtained on doped polyacetylene films, using a variety of dopants including electron acceptors (I2, Br2, SbF5, ClO4-, FeCl3) and electron donors (Li for example)....
RESONANCE RAMAN SCATTERING INDUCED BY POLYACETYLENE AND DERIVATIVES (1983)
In this paper, we recall the main results obtained in Raman scattering on polyacetylene (CH)x, cis or trans, and we concentrate on the experimental point of view. New results are presented,...
The thermal isomerization of polyacetylene studied by Raman scattering (1983)
A study of the thermal isomerization of cis-(CH)x films has been carried out by means of Raman scattering spectroscopy. It is found that the Raman band profiles, induced by trans-(CH)x films, are...
Vibrational analysis of trans-polyacetylene : (CH)x and (CD)x (1983)
Jumeau, D., Lefrant, S., Faulques, E., Buisson, J.P.
We have calculated the normal modes « in the plane » of a trans-polyacetylene chain (CH)x, using a model with twelve force constants. When x is infinite, the Born cyclic condition allows us to...
Raman study of V-centres in X-irradiated KI and RbI (1980)
Raman experiments were carried out on KI and RbI, X-irradiated over a range of temperature for which V-centres are created, After X-irradiation at 190 K, a Raman band was observed at 112 cm-1,...
Raman study of V-centres in X-irradiated KI and RbI (1980)
Raman experiments were carried out on KI and RbI, X-irradiated over a range of temperature for which V-centres are created, After X-irradiation at 190 K, a Raman band was observed at 112 cm-1,...
Raman study of V-centres in X-irradiated KI and RbI (1980)
Raman experiments were carried out on KI and RbI, X-irradiated over a range of temperature for which V-centres are created, After X-irradiation at 190 K, a Raman band was observed at 112 cm-1,...
AGGREGATION OP POSITIVE HOLE CENTRES IN SrCl2, DOPED WITH ALKALI CATIONS (1976)
Rzepka, E., Lefrant, S., Taurel, L.
Formation of aggregates of hole centres (called E centres) in SrCl2 : M+ (M = Na, K, Rb) by X-irradiation between 130 K and 230 K is studied. The results show that the E centre is formed from two...
Magnetic vibrational Raman scattering of KI doped with F centres (1976)
Billardon, M., Russel, M.F., Buisson, J.P., Lefrant, S.
We have studied the Raman scattering under magnetic field by F centres in KI. The spin orbit coupling of the 2P excited state must be taken into account in order to explain the observed spectra. The...
STUDY OF F CENTRES IN QUADRATIC AND ORTHOROMBIC CRYSTALS (1976)
Lefrant, S., Harker, A., Yuste, M., Houlier, B.
We present point-ion calculations of the electronic structure of F centres in BaClF, SrClF and BaCl2. The relative positions of the singlet and doublet absorption bands of the F centres at F- and Cl-...
STUDY OF RAMAN SCATTERING BY KI, NaI AND CsBr DOPED WITH F CENTERS (1976)
Taurel, L., Buisson, J., Ghomi, M., Lefrant, S., Sadoc, A., Chapelle, J., ...
Interpretation of Raman spectra of KI, NaI and CsBr doped with F centers under light excitation in the F band involves the breaking of the usual selection, rules established in off resonance...
STUDY OF U2 CENTRES IN BaClF AND SrClF CRYSTALS (1976)
Yuste, M., Lefrant, S., Taurel, L., Spaeth, J.
Calculation of paramagnetic constants of U2 centre was done on the basis of a Hartree-Fock approximation, including a covalent bonding between the hydrogen atom and its nearest anions. The...
AGGREGATION OP POSITIVE HOLE CENTRES IN SrCl2, DOPED WITH ALKALI CATIONS (1976)
Rzepka, E., Lefrant, S., Taurel, L.
Formation of aggregates of hole centres (called E centres) in SrCl2 : M+ (M = Na, K, Rb) by X-irradiation between 130 K and 230 K is studied. The results show that the E centre is formed from two...
Magnetic vibrational Raman scattering of KI doped with F centres (1976)
Billardon, M., Russel, M.F., Buisson, J.P., Lefrant, S.
We have studied the Raman scattering under magnetic field by F centres in KI. The spin orbit coupling of the 2P excited state must be taken into account in order to explain the observed spectra. The...
STUDY OF F CENTRES IN QUADRATIC AND ORTHOROMBIC CRYSTALS (1976)
Lefrant, S., Harker, A., Yuste, M., Houlier, B.
We present point-ion calculations of the electronic structure of F centres in BaClF, SrClF and BaCl2. The relative positions of the singlet and doublet absorption bands of the F centres at F- and Cl-...
STUDY OF RAMAN SCATTERING BY KI, NaI AND CsBr DOPED WITH F CENTERS (1976)
Taurel, L., Buisson, J., Ghomi, M., Lefrant, S., Sadoc, A., Chapelle, J., ...
Interpretation of Raman spectra of KI, NaI and CsBr doped with F centers under light excitation in the F band involves the breaking of the usual selection, rules established in off resonance...
STUDY OF U2 CENTRES IN BaClF AND SrClF CRYSTALS (1976)
Yuste, M., Lefrant, S., Taurel, L., Spaeth, J.
Calculation of paramagnetic constants of U2 centre was done on the basis of a Hartree-Fock approximation, including a covalent bonding between the hydrogen atom and its nearest anions. The...
AGGREGATION OP POSITIVE HOLE CENTRES IN SrCl2, DOPED WITH ALKALI CATIONS (1976)
Rzepka, E., Lefrant, S., Taurel, L.
Formation of aggregates of hole centres (called E centres) in SrCl2 : M+ (M = Na, K, Rb) by X-irradiation between 130 K and 230 K is studied. The results show that the E centre is formed from two...
Magnetic vibrational Raman scattering of KI doped with F centres (1976)
Billardon, M., Russel, M.F., Buisson, J.P., Lefrant, S.
We have studied the Raman scattering under magnetic field by F centres in KI. The spin orbit coupling of the 2P excited state must be taken into account in order to explain the observed spectra. The...
STUDY OF F CENTRES IN QUADRATIC AND ORTHOROMBIC CRYSTALS (1976)
Lefrant, S., Harker, A., Yuste, M., Houlier, B.
We present point-ion calculations of the electronic structure of F centres in BaClF, SrClF and BaCl2. The relative positions of the singlet and doublet absorption bands of the F centres at F- and Cl-...
STUDY OF RAMAN SCATTERING BY KI, NaI AND CsBr DOPED WITH F CENTERS (1976)
Taurel, L., Buisson, J., Ghomi, M., Lefrant, S., Sadoc, A., Chapelle, J., ...
Interpretation of Raman spectra of KI, NaI and CsBr doped with F centers under light excitation in the F band involves the breaking of the usual selection, rules established in off resonance...
STUDY OF U2 CENTRES IN BaClF AND SrClF CRYSTALS (1976)
Yuste, M., Lefrant, S., Taurel, L., Spaeth, J.
Calculation of paramagnetic constants of U2 centre was done on the basis of a Hartree-Fock approximation, including a covalent bonding between the hydrogen atom and its nearest anions. The...
BLEACHING OF F* CENTRES IN SrCl2 DOPED WITH AN ALKALINE CATION (1973)
Lefrant, S., Chapelle, J., Rzepka, E.
The general properties (optical absorption, ESR) of F centres which appear in SrCl2 : M+ (M+ = Na+, K+, Rb+) are reported. F* centre bleaching in SrCl2 : Na+ at LNT shows that the centres have a...
STRESS AND MAGNETO-OPTICAL STUDIES ON TETRAHEDRAL AND TETRAGONAL F CENTRES IN SrCl2 AND BaCIF (1973)
Duran, J., Lemoyne, D., Lefrant, S., Yuste, M.
Results of magneto-optical and stress linear dichroism on tetrahedral F centre in SrCl2 and tetragonal F centres in BaCIF are presented. In both cases, the excited state Landé factor is found to be...
BLEACHING OF F* CENTRES IN SrCl2 DOPED WITH AN ALKALINE CATION (1973)
Lefrant, S., Chapelle, J., Rzepka, E.
The general properties (optical absorption, ESR) of F centres which appear in SrCl2 : M+ (M+ = Na+, K+, Rb+) are reported. F* centre bleaching in SrCl2 : Na+ at LNT shows that the centres have a...
STRESS AND MAGNETO-OPTICAL STUDIES ON TETRAHEDRAL AND TETRAGONAL F CENTRES IN SrCl2 AND BaCIF (1973)
Duran, J., Lemoyne, D., Lefrant, S., Yuste, M.
Results of magneto-optical and stress linear dichroism on tetrahedral F centre in SrCl2 and tetragonal F centres in BaCIF are presented. In both cases, the excited state Landé factor is found to be...
BLEACHING OF F* CENTRES IN SrCl2 DOPED WITH AN ALKALINE CATION (1973)
Lefrant, S., Chapelle, J., Rzepka, E.
The general properties (optical absorption, ESR) of F centres which appear in SrCl2 : M+ (M+ = Na+, K+, Rb+) are reported. F* centre bleaching in SrCl2 : Na+ at LNT shows that the centres have a...
STRESS AND MAGNETO-OPTICAL STUDIES ON TETRAHEDRAL AND TETRAGONAL F CENTRES IN SrCl2 AND BaCIF (1973)
Duran, J., Lemoyne, D., Lefrant, S., Yuste, M.
Results of magneto-optical and stress linear dichroism on tetrahedral F centre in SrCl2 and tetragonal F centres in BaCIF are presented. In both cases, the excited state Landé factor is found to be...