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arXiv 1003.5161physics.atom-phphysics.plasm-phphysics.space-ph
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类氩离子的双电子极化

Dielectronic Recombination of Argon-Like Ions

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

摘要:

我们提出了一个理论研究的双电子复合(DR)的Ar类离子,揭示了新的光的速率系数的行为在低温下,这些离子形成的光电离等离子体。我们提供的总的和部分麦克斯韦平均DR率系数从K II -锌XIII离子的初始基态的结果。预计这些新的结果将提高类Ar M壳层离子电离平衡的准确性,并为天体物理相关X射线吸收特征的详细建模铺平道路。我们利用AUTOSTRUCTURE计算程序获得了目标离子的准确的核心激发阈值,并在独立过程、孤立共振、扭曲波(IPIRDW)近似下对DR截面进行了多组态Breit-Pauli(MCBP)计算。我们的研究结果调解完全没有直接DR计算某些类Ar离子和现有的经验速率公式的可靠性,往往推断出在此等电子序列的重整化数据的问题。

英文摘要:

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. 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. 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. 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.

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