@article{oai:nifs-repository.repo.nii.ac.jp:00010841,
 author = {KATO,  Daiji and SAKAUE,  Hiroyuki A. and MURAKAMI,  Izumi and Nakamura,  Nobuyuki},
 journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},
 month = {May},
 note = {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 4f135s2 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) [Phys. Rev. A 92 (2015) 022510].},
 pages = {16--20},
 title = {Population trapping: The mechanism for the lost resonance lines in Pm-like ions},
 volume = {408},
 year = {2017}
}