Population trapping: The mechanism for the lost resonance lines in Pm-like ions

[摘要] We report a population kinetics study on line emissions of the Pm-like Bi22+ performed by using a collisional-radiative (CR) model. Population rates of excited levels are analyzed to explain the population trapping in the 4f(13)5s(2) state which causes the loss of the 5s-5p resonance lines in emission spectra. Based on the present analysis, we elucidate why the population trapping is not facilitated for a meta-stable excited level of the Sm-like Bi21+. The emission line spectra are calculated for the Pm-like isoelectronic sequence from Au18+. through W13+ and compared with experimental measurements by electron beam-ion-traps (EBITs). Structures of the spectra are similar for all of the cases except for calculated W13+ spectra. The calculated spectra are hardly reconciled with the measured W13+ spectrum using the compact electron-beam-ion-trap (CoBIT). (C) 2017 Elsevier B.V. All rights reserved.

[发布日期] 2017-10-01

[效力级别]  Proceedings Paper

[关键词] Alkaline metal-like resonance line;Pm-like ion;Meta-stable state;Collisional-radiative model;EBIT;EUV spectra