Atomic data from the IRON Project. I. Electron-impact scattering of Fe17+ using <I>R</I>-matrix theory with intermediate coupling

WITTHOEFT, M. C., BADNELL, N. R., BERRINGTON, K. A., PELAN, J. C. and ZANNA, G. del (2005). Atomic data from the IRON Project. I. Electron-impact scattering of Fe17+ using <I>R</I>-matrix theory with intermediate coupling. Astronomy and astrophysics, 446, 361-366.

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    Link to published version:: 10.1051/0004-6361:20053631

    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 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 n=3 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 n=4 R-matrix calculation leads to good agreement with observation

    Item Type: Article
    Additional Information: © EDP Sciences
    Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Materials and Fluid Flow Modelling Group
    Identification Number: 10.1051/0004-6361:20053631
    Depositing User: Ann Betterton
    Date Deposited: 22 Jun 2007
    Last Modified: 21 Dec 2010 11:32
    URI: http://shura.shu.ac.uk/id/eprint/895

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