Dielectronic recombination of argon-like ions

Nikolic, D. and Gorczyca, T. W. and Korista, K. T. and Badnell, N. R. (2010) Dielectronic recombination of argon-like ions. Astronomy and Astrophysics, 516. A97. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201014485)

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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.


Nikolic, D., Gorczyca, T. W., Korista, K. T. and Badnell, N. R. ORCID logoORCID: https://orcid.org/0000-0001-7418-7996;