Electron-impact single ionizaiton for W4+ and W5+**Project supported by the National Natural Science Foundation of China (Grant Nos. 2017YFA0402300, 11464042, 11564036, 11774292, and 11464040) and the Basic Scientific Research Foundation for Institution of Higher Learning of Gansu Province, China.

Abstract

Electron-impact single ionization cross sections for Wq+ (q = 4–5) were calculated using the flexible atomic code (FAC) in the level-to-level distorted-wave method, considering the explicit branching ratio. The calculated cross sections are compared with the available theoretical and experiment results in detail. In the case of the contribution from the same channles as the available theoretical results, all of the calculated ionization cross sections agree with the experimental measured cross sections. But the present calculated results are larger than the experimental measurement when all channels contributions are included. Some important channels excitation autoionization (EA) contributions, such as the excitation to higher higher subshell from 4f and 5[s,p], were not included into the available theoretical calculation. In general, the distorted-wave (DW) results are overestimated.