Debye-screening effect on electron-impact excitation of helium-like Al11+ and Fe24+ ions

doi:10.1088/1674-1056/ac2e65

Abstract Debye-screening effects on the electron-impact excitation (EIE) processes for the dipole-allowed transition 1s$^{2}$ $^{1}{\rm S} \to 1$s2p $^{1}$P in He-like Al$^{11+}$ and Fe$^{24+}$ ions are investigated using the fully relativistic distorted-wave methods with the-Hückel (DH) model potential. Debye-screening effects on the continuum-bound (CB) interaction and target ion are discussed, both of which result in reduction of EIE cross sections. This reduction due to screening on the CB interaction is dominant. The non-spherical and spherical DH potentials are adopted for considering the screening effect on the CB interaction. It is found that the spherical DH potential could significantly overestimate the influence of plasma screening on EIE cross sections for multielectron He-like ions.

Keywords: Debye plasmas electron-impact excitation Debye-Hückel model potential He-like Al¹¹⁺ and Fe²⁴⁺ ions

Received: 26 July 2021
Revised: 23 September 2021
Accepted manuscript online: 11 October 2021

PACS:	34.50.Fa	(Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))
	52.20.-j	(Elementary processes in plasmas)
	52.20.Fs	(Electron collisions)

Fund: Project supported by the Science Challenge Project (Grant No. TZ2016001), the National Key Research and Development Program of China (Grants Nos. 2017YFA0403200 and 2017YFA0402300), the Funds for Innovative Fundamental Research Group Project of Gansu Province, China (Grant No. 20JR5RA541), and the National Natural Science Foundation of China (Grants Nos. 11774037 and 12064041).

Corresponding Authors: Ling Liu, Yong Wu
E-mail: liu_ling@iapcm.ac.cn;wu_yong@iapcm.ac.cn

Cite this article:

Yu-Long Ma(马玉龙), Ling Liu(刘玲), Lu-You Xie(颉录有), Yong Wu(吴勇), Deng-Hong Zhang(张登红), Chen-Zhong Dong(董晨钟), Yi-Zhi Qu(屈一至), and Jian-Guo Wang(王建国) Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions 2022 Chin. Phys. B 31 043401

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Debye-screening effect on electron-impact excitation of helium-like Al11+ and Fe24+ ions

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Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions