Photoionization and photoabsorption study of Ne-like Mg2+, Al3+ and Si4+ ions using the relativistic configuration interaction method

IF 1.4 Q2 Physics and Astronomy

Physics Open Pub Date : 2025-08-22 DOI:10.1016/j.physo.2025.100317

G.A. Alna'washi , O. Abu-Haija , S.M. Hamasha

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Abstract

This paper presents comprehensive calculations of resonance energies for photoabsorption and photoionization of Ne-like Mg²⁺, Al³⁺ and Si⁴⁺ ions. We report ionization threshold limits, resonance energies, wavelengths, transition rates, and oscillator strengths for 1s² 2s 2p⁶ (²S_1/2) np (¹P₁), 1s 2s² 2p⁶ (²S_1/2) np (¹P₁), 2s² 2p⁵ (²P) ns, and 2s² 2p⁵ (²P) nd Rydberg series. All the calculations were performed using the relativistic configuration interaction (RCI) method within the Flexible Atomic Code (FAC). The RCI results show very good agreement with existing theoretical and experimental values reported in literature. Moreover, we present new tabulations of K-shell photoexcitation for Mg²⁺, Al³⁺ and Si⁴⁺ ions, as well as unreported outer-shell resonance features to highly excited states. This provides an improved description of the photoabsorption spectrum, which are important for high-precision spectral modeling in astrophysical plasmas.

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用相对论组态相互作用方法研究类ne Mg2+， Al3+和Si4+离子的光电离和光吸收

本文综合计算了类ne Mg2+、Al3+和Si4+离子的光吸收和光电离共振能。我们报道了1s2 2s 2p6 (2S1/2) np （1P1）、1s 2s2 2p6 (2S1/2) np （1P1）、2s2 2p5 (2P) ns、2s2 2p5 （2P）和Rydberg系列的电离阈值、共振能量、波长、跃迁速率和振荡器强度。所有计算均使用柔性原子代码（FAC）中的相对论组态相互作用（RCI）方法进行。RCI结果与现有文献报道的理论和实验值非常吻合。此外，我们提出了Mg2+， Al3+和Si4+离子的k壳光激发的新表格，以及未报道的高激发态的外壳共振特征。这为天体物理等离子体的高精度光谱建模提供了一种改进的光吸收光谱描述方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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