Atomic data from the IRON project LXIII: Electron-impact excitation of Fe19+ up to n=4

M. C. Witthoeft, G. Del Zanna, N. R. Badnell

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14 Citations (Scopus)

Abstract

We present results for the electron-impact excitation of N-like Fe as part of the RmaX network. R-matrix theory using an intermediatec-oupling frame transformation method is used to obtain level-resolved collision strengths. Separate calculations are performed using different target expansions. The first is a 215 level close-coupling calculation which has the 2s(2) 2p(3), 2s 2p(4), 2p(5), 2s(2) 2p(2) 3l, and 2s 2p3 3l configurations while the second calculation also includes the levels from the 2s(2) 2p(2) 4l configurations for a total of 302 close-coupling levels. The effect of the additional resonant enhancement of the larger calculation is explored and compared with a previous IRON Project report and other, more recent, calculations. As a final comparison, we model an astrophysical plasma using the results of the present calculations and previous work.

Original languageEnglish
Pages (from-to)763-770
Number of pages8
JournalAstronomy and Astrophysics
Volume466
Issue number2
DOIs
Publication statusPublished - May 2007

Keywords

  • atomic data
  • atomic processes
  • scattering
  • highly ionized iron
  • emission lines
  • FE-XX
  • ions
  • transitions
  • plasmas

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