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

doi:10.1088/1674-1056/27/7/073101

Abstract 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 (¹S₀) and 1s2p (³P_0,1) atomic states. The results reported at the present work are useful for plasma diagnostics.

Keywords: fine-structure energy levels hard sphere confinement free electron screening He-like Ar

Received: 26 May 2018
Accepted manuscript online:

PACS:	31.15.ac	(High-precision calculations for few-electron (or few-body) atomic systems)
	31.15.ag	(Excitation energies and lifetimes; oscillator strengths)
	31.15.xr	(Self-consistent-field methods)
	52.27.Gr	(Strongly-coupled plasmas)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11474208) and the Doctoral Science Foundation of Longdong University, China (Grant No. XYBY1704).

Corresponding Authors: Gang Jiang
E-mail: gjiang@scu.edu.cn

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Xiang-Fu Li(李向富), Gang Jiang(蒋刚) Relativistic calculations of fine-structure energy levels of He-like Ar in dense plasmas 2018 Chin. Phys. B 27 073101

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

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