Electron impact excitation rates for transitions in Mg v

Kanti M. Aggarwal*, Francis P. Keenan

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Energy levels, radiative rates (A-values), and lifetimes, calculated with the GRASP code, are reported for an astrophysically important O-like ion, Mg V. Results are presented for transitions among the lowest 86 levels belonging to the 2s22p4, 2s2p5, 2p6, and 2s22p33l configurations. There is satisfactory agreement with earlier data for most levels and transitions, but scope remains for improvement. Collision strengths are also calculated, with the DARC code, and the results obtained are comparable for most transitions (at energies above thresholds) with earlier work using the DW code. In the threshold region, resonances have been resolved in a fine energy mesh to determine values of effective collision strengths (Y) as accurately as possible. Results are reported for all transitions at temperatures up to 106 K, which should be sufficient for most astrophysical applications. However, a comparison with earlier data reveals discrepancies of up to two orders of magnitude for over 60% of transitions, at all temperatures. The reasons for these discrepancies are discussed in detail.

Original languageEnglish
Pages (from-to)9-20
Number of pages12
JournalCanadian Journal of Physics
Volume95
Issue number1
Early online date30 Sep 2016
DOIs
Publication statusPublished - 12 Feb 2017

Keywords

  • Collision strengths
  • Effective collision strengths
  • Energy levels
  • Lifetimes
  • Radiative rates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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