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 0922-6435Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||atomic data, atomic processes, F-like ions, collision strengths, oscillator strenghts, XVIII, transitions, Physics, Astronomy and Astrophysics, Space and Planetary Science|
|Subjects:||Science > Physics|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||13 Jul 2011 08:55|
|Last modified:||22 Mar 2017 11:24|