Relativistic radiatively damped <i>R</i> -matrix calculations of the electron-impact excitation of helium-like iron and krypton
Data(s) |
2009
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Resumo |
Electron-impact excitation data for He-like ions are of significant importance for diagnostic applications to both laboratory and astrophysical plasmas. Here we report on the first fully relativistic R -matrix calculations with radiation damping for the He-like ions Fe 24+ and Kr 34+ . Effective collision strengths for these two ions have been determined with and without damping over a wide temperature range for all transitions between the 49 levels through n = 5. We find that damping has a pronounced effect on the effective collision strengths for excitation to some of the low-lying levels, but its effect on excitation to the vast majority of levels is small. At the energy of a resonance peak, we also investigate the effect of radiation damping on the angular distribution of scattered electrons. Finally, we compare our results for Fe 24+ with an earlier intermediate coupling frame transformation R -matrix calculation with radiation damping by Whiteford et al ( J. Phys. B: At. Mol. Opt. Phys. 34 3179) and find good agreement, especially for excitation to the lower levels. |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Griffin , D C & Ballance , C P 2009 , ' Relativistic radiatively damped R -matrix calculations of the electron-impact excitation of helium-like iron and krypton ' Journal of Physics B: Atomic, Molecular and Optical Physics , vol 42 , no. 23 , pp. 235201 . DOI: 10.1088/0953-4075/42/23/235201 |
Tipo |
article |