Theoretical investigation of electron-impact ionization of W8+ ion

doi:10.1088/1674-1056/ad1487

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 33401-033401.doi: 10.1088/1674-1056/ad1487

Theoretical investigation of electron-impact ionization of W⁸⁺ ion

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)

Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

收稿日期:2023-11-14 修回日期:2023-12-06 接受日期:2023-12-12 出版日期:2024-02-22 发布日期:2024-03-06
通讯作者: Denghong Zhang E-mail:zhangdh@nwnu.edu
基金资助:
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).

Theoretical investigation of electron-impact ionization of W⁸⁺ ion

Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2023-11-14 Revised:2023-12-06 Accepted:2023-12-12 Online:2024-02-22 Published:2024-03-06
Contact: Denghong Zhang E-mail:zhangdh@nwnu.edu
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: tungsten ions, electron-impact ionization, cross section

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.

Key words: tungsten ions, electron-impact ionization, cross section

中图分类号: (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))

34.50.Fa

34.80.Dp (Atomic excitation and ionization) 32.80.Aa (Inner-shell excitation and ionization)

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[J]. 中国物理B, 2024, 33(3): 33401-033401.

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Theoretical investigation of electron-impact ionization of W⁸⁺ ion

Theoretical investigation of electron-impact ionization of W⁸⁺ ion

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