Electron impact excitation of Be-like ions: a comparison of DARC and ICFT results

Kanti M. Aggarwal, Francis P. Keenan

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16 Citations (Scopus)

Abstract

Emission lines of Be-like ions are frequently observed in astrophysical plasmas, and many are useful for density and temperature diagnostics. However, accurate atomic data for energy levels, radiative rates (A-values) and effective electron excitation collision strengths ($\Upsilon$) are required for reliable plasma modelling. In general it is reasonably straightforward to calculate energy levels and A- values to a high level of accuracy. By contrast, considerable effort is required to calculate $\Upsilon$, and hence it is not always possible to assess the accuracy of available data. Recently, two independent calculations (adopting the $R$-matrix method) but with different approaches (DARC and ICFT) have appeared for a range of Be-like ions. Therefore, in this work we compare the two sets of $\Upsilon$, highlight the large discrepancies for a significant number of transitions and suggest possible reasons for these.
Original languageEnglish
Pages (from-to)3849-3855
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Early online date30 Jan 2015
DOIs
Publication statusPublished - 11 Mar 2015

Bibliographical note

9 pages including 2 figures, will appear in 2015 MNRAS

Keywords

  • astro-ph.SR
  • physics.atom-ph

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