Radiative transition rates and collision strengths for Si II (2009)
Bautista, M. A., Quinet, P., Palmeri, P., Badnell, N. R., Dunn, J., Arav, N.
Aims. This work reports radiative transition rates and electron impact excitation collision strengths for levels of the 3s23p, 3s3p2, 3s24s, and 3s23d configurations of Siii. Methods. The radiative...
Lestinsky, M., Badnell, N. R., Bernhardt, D., Grieser, M., Hoffmann, J., Lukić, D., ...
We have measured electron-ion recombination for Fe$^{9+}$ forming Fe$^{8+}$ and for Fe$^{10+}$ forming Fe$^{9+}$ using merged beams at the TSR heavy-ion storage-ring in Heidelberg. The measured...
Liang, G Y, Whiteford, A D, Badnell, N R
We present results for the inner-shell electron-impact excitation of Fe$^{15+}$ using the intermediate-coupling frame transformation {\it R}-matrix approach in which Auger-plus-radiation damping has...
Dielectronic recombination and stability of warm gas in active galactic nuclei (2008)
Chakravorty, Susmita, Kembhavi, Ajit K., Elvis, Martin, Ferland, Gary, Badnell, N.R.
Understanding the thermal equilibrium (stability) curve may offer insights into the nature of the warm absorbers often found in active galactic nuclei. Its shape is determined by factors such as the...
Dielectronic recombination and stability of warm gas in active galactic nuclei (2008)
Chakravorty, Susmita, Kembhavi, Ajit K., Elvis, Martin, Ferland, Gary, Badnell, N.R.
Understanding the thermal equilibrium (stability) curve may offer insights into the nature of the warm absorbers often found in active galactic nuclei. Its shape is determined by factors such as the...
at the Heidelberg Test Storage Ring," Nucl. Instrum. Methods Phys. Res. B (2007)
Bray And, J. Linkmann, N. R. Badnell, C. Broude, D. Habs, G. Hofmann, ...
zation," Phys. Rev. A 48, R22 (1993). [21] Kisielius, R., K.A. Berrington, P.H. Norrington, "Electron-excitation of the fine-structure transitions in Hydrogen-like ions He-II and...
Electron-Impact Ionization of Atomic Ions in the Na Isoelectronic Sequence (2007)
M. S. Pindzola, D. M. Mitnik, J. A. Shaw, D. C. Griffin, N. R. Badnell, H. P. Summers, ...
A database is assembled which contains electron-impact ionization rate coefficients for selected atomic ions in the Na isoelectronic sequence. The rate coefficients are obtained from a Maxwellian...
Absolute Cross Sections for Excitation of the 2s (2007)
Transition In And, Transition In B, O. Woitke, N. Djuric, G. H. Dunn, M. E. Bannister, ...
Absolute cross sections for electron-impact excitation of the 2s transition of B measured between 5.4 eV and 7.0 eV are presented. The results are in good agreement with the...
Dielectronic recombination and stability of warm gas in AGN (2007)
Chakravorty, Susmita, Kembhavi, Ajit K., Elvis, Martin, Ferland, Gary, Badnell, N. R.
Understanding the thermal equilibrium (stability) curve may offer insights into the nature of the warm absorbers often found in active galactic nuclei. Its shape is determined by factors like the...
Lukić, D.V., Schnell, M., Savin, D.W., Brandau, C., Schmidt, E.W., Böhm, S., ...
We have measured resonance strengths and energies for dielectronic recombination (DR) of Mg-like Fe xv forming Al-like Fe xiv via core excitations in the electron-ion collision energy range 0-45 eV....
Lukić, D.V., Schnell, M., Savin, D.W., Brandau, C., Schmidt, E.W., Böhm, S., ...
We have measured resonance strengths and energies for dielectronic recombination (DR) of Mg-like Fe xv forming Al-like Fe xiv via core excitations in the electron-ion collision energy range 0-45 eV....
Electron-impact excitation of neutral boron using the R-matrix with pseudostates method (2007)
Ballance, C. P., Griffin, D. C., Berrington, K. A., Badnell, N. R.
We have carried out a large R-matrix with pseudostates (RMPS) calculation of the electron-impact excitation of neutral boron. The RMPS method has been employed for the excitation/ionisation of many...
The time-dependent close-coupling method for atomic and molecular collision processes (2007)
Pindzola, M.S., Robicheaux, F., Loch, S.D., Berengut, J.C., Topcu, T., Colgan, J., ...
Meléndez, M., Bautista, M.A., Badnell, N.R.
Aims.This work reports radiative transition rates and electron impact excitation rate coefficients for levels of the n = 3, 4, 5, 6, 7, 8 configurations of . Methods.The radiative data were computed...
Meléndez, M., Bautista, M.A., Badnell, N.R.
Aims.This work reports radiative transition rates and electron impact excitation rate coefficients for levels of the n = 3, 4, 5, 6, 7, 8 configurations of . Methods.The radiative data were computed...
Dielectronic recombination of Fe13+: benchmarking the M-shell (2006)
We have carried-out a series of multi-configuration Breit-Pauli AUTOSTRUCTURE calculations for the dielectronic recombination of Fe13+. We present a detailed comparison of the results with the...
Dielectronic recombination of Fe13+: benchmarking the M-shell (2006)
We have carried-out a series of multi-configuration Breit-Pauli AUTOSTRUCTURE calculations for the dielectronic recombination of Fe13+. We present a detailed comparison of the results with the...
Radiative recombination data for modeling dynamic finite-density plasmas (2006)
We have calculated partial final-state resolved radiative recombination (RR) rate coefficients from the initial ground and metastable levels of all elements up to and including Zn, plus Kr, Mo, and...
Bryans, P., Badnell, N.R., Gorczyca, T.W., Laming, J.M., Mitthumsiri, W., Savin, D.W.
Reliably interpreting spectra from electron-ionized cosmic plasmas requires accurate ionization balance calculations for the plasma in question. However, much of the atomic data needed for these...
Radiative recombination data for modeling dynamic finite-density plasmas (2006)
We have calculated partial final-state resolved radiative recombination (RR) rate coefficients from the initial ground and metastable levels of all elements up to and including Zn, plus Kr, Mo, and...
Bryans, P., Badnell, N.R., Gorczyca, T.W., Laming, J.M., Mitthumsiri, W., Savin, D.W.
Reliably interpreting spectra from electron-ionized cosmic plasmas requires accurate ionization balance calculations for the plasma in question. However, much of the atomic data needed for these...
We have carried out multiconfiguration Breit-Pauli AUTOSTRUCTURE calculations for the dielectronic recombination (DR) of Fe8+-Fe12+ ions. We obtain total DR rate coefficients for the initial ground...
Summers, H.P., Dickson, W.J., O'Mullane, M.G., Badnell, N.R., Whiteford, A.D., Brooks, D.H., ...
The paper presents an integrated view of the population structure and its role in establishing the ionization state of light elements in dynamic, finite density, laboratory and astrophysical plasmas....
Summers, H.P., Dickson, W.J., O'Mullane, M.G., Badnell, N.R., Whiteford, A.D., Brooks, D.H., ...
The paper presents an integrated view of the population structure and its role in establishing the ionization state of light elements in dynamic, finite density, laboratory and astrophysical plasmas....
Updated opacities from the Opacity Project (2005)
Badnell, N.R., Bautista, M.A., Butler, K., Delahaye, F., Mendoza, C., Palmeri, P., ...
Using the code autostructure, extensive calculations of inner-shell atomic data have been made for the chemical elements He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Cr, Mn, Fe and Ni. The results are...
Updated opacities from the Opacity Project (2005)
Badnell, N.R., Bautista, M.A., Butler, K., Delahaye, F., Mendoza, C., Palmeri, P., ...
Using the code autostructure, extensive calculations of inner-shell atomic data have been made for the chemical elements He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Cr, Mn, Fe and Ni. The results are...
Witthoeft, M. C., Badnell, N. R., Berrington, K. A., Pelan, J. C., Zanna, G. Del
We present results for electron-impact excitation of F-like Fe calculated using R-matrix theory where an intermediate-coupling frame transformation (ICFT) is used to obtain level-resolved collision...
Electron-impact excitation of Xe26+ and its resultant spectral signature (2004)
Badnell, N.R., Berrington, K.A., Summers, H.P., O'Mullane, M.G., Whiteford, A.D., Ballance, C.P.
We have carried out a 129 close-coupling level Dirac-Coulomb R-matrix calculation for the electron-impact excitation of Ni-like Xe. We have utilized this data to generate the spectral signature of...
Electron-impact excitation of Xe26+ and its resultant spectral signature (2004)
Badnell, N.R., Berrington, K.A., Summers, H.P., O'Mullane, M.G., Whiteford, A.D., Ballance, C.P.
We have carried out a 129 close-coupling level Dirac-Coulomb R-matrix calculation for the electron-impact excitation of Ni-like Xe. We have utilized this data to generate the spectral signature of...
A comparison of Rosseland-mean opacities from OP and OPAL (2004)
Monochromatic opacities from the Opacity Project (OP) have been augmented by hitherto missing inner-shell contributions. OP Rosseland-mean opacities, κR, are compared with results from OPAL for the...
A comparison of Rosseland-mean opacities from OP and OPAL (2004)
Monochromatic opacities from the Opacity Project (OP) have been augmented by hitherto missing inner-shell contributions. OP Rosseland-mean opacities, κR, are compared with results from OPAL for the...
On the importance of inner-shell transitions for opacity calculations (2003)
For high temperatures and densities, stellar opacities obtained from the Opacity Project (OP) were smaller than those obtained from the OPAL project. Iglesias and Rogers (1995 Astrophys. J. 443 469)...
On the importance of inner-shell transitions for opacity calculations (2003)
For high temperatures and densities, stellar opacities obtained from the Opacity Project (OP) were smaller than those obtained from the OPAL project. Iglesias and Rogers (1995 Astrophys. J. 443 469)...
On the importance of inner-shell transitions for opacity calculations (2003)
For high temperatures and densities, stellar opacities obtained from the Opacity Project (OP) were smaller than those obtained from the OPAL project. Iglesias and Rogers [Ap.J. v443, 469 (1995)]...
Dielectric recombination data for dynamic finite-density plasmas I. Goals and methodology (2003)
Badnell, N.R., Summers, H.P., O'Mullane, M.G., Altun, Z., Colgan, J., Bautista, M.A., ...
A programme is outlined for the assembly of a comprehensive dielectronic recombination database within the generalized collisional-radiative (GCR) framework. It is valid for modelling ions of...
Assessment of the fluorescence and auger database used in plasma modeling (2003)
Gorczyca, T.W., Kodituwakku, C.N., Korista, K.T., Zatsarinny, O., Badnell, N.R., Behar, E., ...
We have investigated the accuracy of the vacancy fluorescence database of Kaastra & Mewe resulting from the initial atomic physics calculations and the subsequent scaling along isoelectronic...
Assessment of the fluorescence and auger database used in plasma modeling (2003)
Gorczyca, T.W., Kodituwakku, C.N., Korista, K.T., Zatsarinny, O., Badnell, N.R., Behar, E., ...
We have investigated the accuracy of the vacancy fluorescence database of Kaastra & Mewe resulting from the initial atomic physics calculations and the subsequent scaling along isoelectronic...
Observation of trielectronic recombination in Be-like Cl ions (2003)
Schnell, M., Gwinner, G., Badnell, N.R., Bannister, M.E., Böhm, S., Colgan, J., ...
Recombination involving the core excitation of two electrons, which may be termed trielectronic recombination, has been experimentally identified for the first time. Using Cl13+ ions circulating in...
Observation of trielectronic recombination in Be-like Cl ions (2003)
Schnell, M., Gwinner, G., Badnell, N.R., Bannister, M.E., Böhm, S., Colgan, J., ...
Recombination involving the core excitation of two electrons, which may be termed trielectronic recombination, has been experimentally identified for the first time. Using Cl13+ ions circulating in...
Observation of Trielectronic Recombination in Be-like Cl Ions (2003)
Schnell, M., Gwinner, G., Badnell, N.R., Bannister, M.E., Böhm, S., Colgan, J., ...
Recombination involving the core excitation of two electrons, which may be termed trielectronic recombination, has been experimentally identified for the first time. Using Cl13+ ions circulating in...
Atomic data for modelling fusion and astrophysical plasmas (2002)
Summers, H.P., Badnell, N.R., Whiteford, A.D., O'Mullane, M., Bingham, R., Kellett, B.J., ...
Trends and focii of interest in atomic modelling and data are identified in connection with recent observations and experiments in fusion and astrophysics. In the fusion domain, spectral observations...
Savin, D.W., Behar, E., Kahn, S.M., Gwinner, G., Saghiri, A.A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR...
Savin, D.W., Behar, E., Kahn, S.M., Gwinner, G., Saghiri, A.A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR...
Atomic data for modelling fusion and astrophysical plasmas (2002)
Summers, H. P., Badnell, N. R., O'Mullane, M. G., Whiteford, A. D., Bingham, R., Kellet, B. J., ...
Savin, D. W., Behar, E., Kahn, S. M., Gwinner, G., Saghiri, A. A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 --> N' = 2 (DeltaN = 0) core excitations. We have also calculated the DR...
Savin, Daniel W., Kahn, S.M., Linkemann, J., Saghiri, A.A., Schmitt, M., Grieser, M., ...
We have measured resonance strengths and energies for dielectronic recombination (DR) of Fe XIX forming Fe XVIII via N = 2 N = 2 and N = 2 N = 3 core excitations. All measurements were carried out...
Dielectronic recombination of ground-state and metastable Li+ ions (1999)
Saghiri, A.A., Linkemann, J., Schmitt, M., Schwalm, D., Wolf, A., Bartsch, T., ...
Dielectronic recombination has been investigated for Δn=1 resonances of ground-state Li+(1s2) and for Δn=0 resonances of metastable Li+(1s2s 3S). The ground-state spectrum shows three prominent...
Dielectronic recombination of ground-state and metastable Li+ ions (1999)
Saghiri, A.A., Linkemann, J., Schmitt, M., Schwalm, D., Wolf, A., Bartsch, T., ...
Dielectronic recombination has been investigated for Δn=1 resonances of ground-state Li+(1s2) and for Δn=0 resonances of metastable Li+(1s2s 3S). The ground-state spectrum shows three prominent...
Savin, D.W., Kahn, S.M., Linkemann, J., Saghiri, A.A., Schmitt, M., Grieser, M., ...
In photoionized gases with cosmic abundances, dielectronic recombination (DR) proceeds primarily via nlj → nl′j′ core excitations (n = 0 DR). We have measured the resonance strengths and...
Savin, D.W., Kahn, S.M., Linkemann, J., Saghiri, A.A., Schmitt, M., Grieser, M., ...
In photoionized gases with cosmic abundances, dielectronic recombination (DR) proceeds primarily via nlj → nl′j′ core excitations (n = 0 DR). We have measured the resonance strengths and...