1. Population trapping: The mechanism for the lost resonance lines in Pm-like ions
- Author
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Hiroyuki A. Sakaue, Daiji Kato, Nobuyuki Nakamura, and Izumi Murakami
- Subjects
Nuclear and High Energy Physics ,education.field_of_study ,Chemistry ,Population ,Resonance ,Trapping ,Meta-stable state ,EUV spectra ,01 natural sciences ,Spectral line ,010305 fluids & plasmas ,Ion ,Excited state ,0103 physical sciences ,Pm-like ion ,Collisional-radiative modelEBIT ,Emission spectrum ,Atomic physics ,Alkaline metal-like resonance line ,010306 general physics ,education ,Instrumentation ,Line (formation) - Abstract
We report a population kinetics study on line emissions of the Pm-like Bi 22+ performed by using a collisional-radiative (CR) model. Population rates of excited levels are analyzed to explain the population trapping in the 4 f 13 5 s 2 state which causes the loss of the 5 s − 5 p 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 Bi 21+ . The emission line spectra are calculated for the Pm-like isoelectronic sequence from Au 18+ through W 13+ 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 W 13+ spectra. The calculated spectra are hardly reconciled with the measured W 13+ spectrum using the compact electron-beam-ion-trap (CoBIT) [Phys. Rev. A 92 (2015) 022510].
- Published
- 2017
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