Dielectronic recombination of argon-like ions

D. Nikolic, T. W. Gorczyca, K. T. Korista, N. R. Badnell

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Context. We present a theoretical investigation of dielectronic recombination (DR) of Ar-like ions that sheds new light on the behavior of the rate coefficient at low-temperatures where these ions form in photoionized plasmas.

Aims. We provide results for the total and partial Maxwellian-averaged DR rate coefficients from the initial ground level of K II-Zn XIII ions. It is expected that these new results will advance the accuracy of the ionization balance for Ar-like M-shell ions and pave the way towards a detailed modeling of astrophysically relevant X-ray absorption features.

Methods. We utilize the AUTOSTRUCTURE computer code to obtain the accurate core-excitation thresholds in target ions and carry out multiconfiguration Breit-Pauli (MCBP) calculations of the DR cross section in the independent-processes, isolated-resonance, distorted-wave (IPIRDW) approximation.

Results. Our results mediate the complete absence of direct DR calculations for certain Ar-like ions and question the reliability of the existing empirical rate formulas, often inferred from renormalized data within this isoelectronic sequence.

Original languageEnglish
Pages (from-to)A97
Number of pages12
JournalAstronomy and Astrophysics
Volume516
DOIs
Publication statusPublished - 21 Jul 2010

Keywords

  • atomic data
  • atomic processes
  • plasmas
  • scattering
  • electron-impact excitation
  • optically thin plasmas
  • active galactic nuclei
  • collisional ionization equilibrium
  • R-matrix method
  • rate coefficients
  • energy-levels
  • ni-xi
  • density plasmas

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