Volume 516, June-July 2010
|Number of page(s)||12|
|Section||Atomic, molecular, and nuclear data|
|Published online||21 July 2010|
Dielectronic recombination of argon-like ions
Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA e-mail: email@example.com
2 Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK
Accepted: 16 April 2010
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.
Key words: atomic data / atomic processes / plasmas / scattering
© ESO, 2010
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