Relativistic calculations of fine-structure energy levels of He-like Ar in dense plasmas

Relativistic calculations of fine-structure energy levels of He-like Ar in dense plasmas
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稠密等离子体中类氦Ar精细结构能级的相对论计算

DOI:
10.1088/1674-1056/27/7/073101
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发表时间:
2018-07
期刊:
影响因子:
1.7
通讯作者:
Jiang Gang
Jiang Gang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li Xiang-Fu;Jiang Gang

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计算了类氦氩离子在稠密等离子体中1 s2 s和1 s2 p原子态的精细结构能级。采用离子球模型描述等离子体对被测离子的屏蔽效应。分别研究了硬球约束和等离子体屏蔽对精细结构能级的影响。计算结果表明,随着硬球半径的减小,硬球对精细结构能级的限制作用增强;随着自由电子密度的增加,等离子体对精细结构能级的屏蔽作用增强。在稠密等离子体中,与自由电子屏蔽的贡献相比,硬球对精细结构能级的限制作用一般可以忽略。在1 s2 s(1 S 0)和1 s2 p(3 P0,1)原子态之间发现了一个有趣的能级交叉现象.本工作的结果对等离子体诊断是有用的。
The fine-structure energy levels of 1s2s and 1s2p atomic states for the He-like Ar ion immersed in dense plasmas are calculated. The ion sphere model is used to describe the plasma screening effect on the tested ion. The influences of the hard sphere confinement and plasma screening on the fine-structure energy levels are investigated respectively. The calculated results show that the confined effect of the hard sphere on the fine-structure energy levels increases with decreasing hard sphere radius, and the plasma screening effect on the fine-structure energy levels increases with the increase of free electron density. In dense plasmas, the confined effect of the hard sphere on the fine-structure energy levels can be neglected generally, compared with the contribution from free electron screening. An interesting phenomenon about the energy level crossing is found among 1s2s (1 S 0) and 1s2p (3 P 0, 1) atomic states. The results reported at the present work are useful for plasma diagnostics.
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