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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:408

Article; Proceedings Paper

Kato, Daiji^1,2  Sakaue, Hiroyuki A.¹  Murakami, Izumi^1,2  Nakamura, Nobuyuki³ 

[1] Natl Inst Fus Sci, Gifu 5095292, Japan

[2] SOKENDAI, Dept Fus Sci, Gifu 5095292, Japan

[3] Univ Electrocommun, Inst Laser Sci, Tokyo 1828585, Japan

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

DOI  :  10.1016/j.nimb.2017.05.029

来源: Elsevier

【 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.

【 授权许可】

Free