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Atomic data from the IRON project LX : Electron-impact excitation of n=3, 4 levels of Fe17+

Witthoeft, M.C. and Badnell, N.R. and Del Zanna, G. and Berrington, K.A. and Pelan, J.C. (2006) Atomic data from the IRON project LX : Electron-impact excitation of n=3, 4 levels of Fe17+. Experimental Astronomy, 446 (1). pp. 361-366. ISSN 0922-6435

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Abstract

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 2s(2) 2p(5), 2s 2p(6), 2s2 2p(4)3l, 2s 2p(5)3l, and 2p(6)3l configurations while the second calculation includes the 2s(2) 2p(4)4l, 2s 2p(5)4l, and 2p(6)4l configurations as well. The effect of the additional structure in the latter calculation on the n = 3 resonances is explored and compared with previous calculations. We find strong resonant enhancement of the effective collision strengths to the 2s(2) 2p(4) 3s levels. A comparison with a Chandra X-ray observation of Capella shows that the n = 4 R-matrix calculation leads to good agreement with observation.

Item type: Article
ID code: 31188
Keywords: atomic data, atomic processes, F-like ions, collision strengths, oscillator strenghts, XVIII, transitions, Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 13 Jul 2011 09:55
    Last modified: 17 Jul 2013 10:30
    URI: http://strathprints.strath.ac.uk/id/eprint/31188

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