中国物理B ›› 2024, Vol. 33 ›› Issue (3): 33401-033401.doi: 10.1088/1674-1056/ad1487
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)
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)
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.
中图分类号: (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))