Theoretical investigation of electron-impact ionization of W8+ ion

doi:10.1088/1674-1056/ad1487

Abstract The electron-impact single ionization cross section for W⁸⁺ ion has been calculated using flexible atomic code, employing the level-to-level distorted-wave approximation. This calculations takes into account contributions form both direct ionization (DI) and excitation autoionization (EA). However, the theoretical predictions, based solely on the ground state, tends to underestimate the experimental values. This discrepancy can be mitigated by incorporation contributions from excited states. We extended the theoretical analysis, including the contributions from the long-lived metastable states with lifetimes exceeding 1.5×10^-5 s. We employed two statistical models to predict the fraction of ground state ions in the parent ion beam. Assuming a 79% fraction of parent ions in ground configuration, the experiment measurements align with the predictions. Furthermore we derived the theoretical cross-section for the ground state as correlated plasma rate coefficients, and compared it with existing data. Despite the uncertainty in our calculations, our results are still acceptable.

Keywords: tungsten ions electron-impact ionization cross section

Received: 14 November 2023
Revised: 06 December 2023
Accepted manuscript online: 12 December 2023

PACS:	34.50.Fa	(Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))
	34.80.Dp	(Atomic excitation and ionization)
	32.80.Aa	(Inner-shell excitation and ionization)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12364034), the National Key Research and Development Program of China (Grant No. 2022YFA1602501), and the Science and Technology Project of Gansu Province, China (Grant No.23YFFA0074).

Corresponding Authors: Denghong Zhang
E-mail: zhangdh@nwnu.edu

Cite this article:

Shiping Zhang(张世平), Fangjun Zhang(张芳军), Denghong Zhang(张登红), Xiaobin Ding(丁晓彬), Jun Jiang(蒋军), Luyou Xie(颉录有), Yulong Ma(马玉龙), Maijuan Li(李麦娟), Marek Sikorski, and Chenzhong Dong(董晨钟) Theoretical investigation of electron-impact ionization of W⁸⁺ ion 2024 Chin. Phys. B 33 033401

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Theoretical investigation of electron-impact ionization of W8+ ion

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Theoretical investigation of electron-impact ionization of W⁸⁺ ion