Volume 446, Number 1, January IV 2006
|Page(s)||361 - 366|
|Section||Atomic, molecular, and nuclear data|
|Published online||09 January 2006|
Atomic data from the IRON project
LX. Electron-impact excitation of n = 3, 4 levels of Fe
Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK e-mail: firstname.lastname@example.org
2 MSSL, University College London, Holmbury St., Mary Dorking, RH5 6NT, UK
3 School of Science and Mathematics, Sheffield Hallam University, Sheffield, S1 1WB, UK
4 Gatsby Computational Neuroscience Unit, University College, 17 Queen Square, London, WC1N 3AR, UK
Accepted: 1 September 2005
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 strengths. Two such calculations are performed, the first expands the target using 2s2 2p5, 2s 2p6, 2s2 2p4 3l, 2s 2p5 3l, and 2p6 3l configurations while the second calculation includes the 2s2 2p4 4l, 2s 2p5 4l, and 2p6 4l configurations as well. The effect of the additional structure in the latter calculation on the resonances is explored and compared with previous calculations. We find strong resonant enhancement of the effective collision strengths to the 2s2 2p4 3s levels. A comparison with a Chandra X-ray observation of Capella shows that the R-matrix calculation leads to good agreement with observation.
Key words: atomic data / atomic processes
© ESO, 2006
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