Validity of the ICFT R-matrix method: Be-like Al 9+ a case study

L. Fernández-Menchero, G. Del Zanna, Nigel Badnell

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Abstract

We have carried out 98-level configuration-interaction/close-coupling (CI/CC) intermediate coupling frame transformation (ICFT) and Breit–Pauli R-matrix calculations for the electron-impact excitation of Be-like Al 9+. The close agreement that we find between the two sets of effective collision strengths demonstrates the continued robustness of the ICFT method. On the other hand, a comparison of this data with previous 238-level CI/CC ICFT effective collision strengths shows that the results for excitation up to n = 4 levels are systematically and increasingly underestimated over a wide range of temperatures by R-matrix calculations whose CC expansion extends only to n = 4 (98-levels). Thus, we find to be false a recent conjecture that the ICFT approach may not be completely robust. The conjecture was based upon a comparison of 98-level CI/CC Dirac R-matrix effective collision strengths for Al 9+ with those from the 238-level CI/CC ICFT R-matrix calculations. The disagreement found recently is due to a lack of convergence of the CC expansion in the 98-level CI/CC Dirac work. The earlier 238-level CI/CC ICFT work has a superior target to the 98-level CI/CC Dirac one and provides more accurate atomic data. Similar considerations need to be made for other Be-like ions and for other sequences.
Original languageEnglish
Pages (from-to)4174-4183
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume450
Issue number4
Early online date20 May 2015
DOIs
Publication statusPublished - 11 Jul 2015

Keywords

  • atomic data
  • corona
  • intermediate coupling frame transformation

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