5p-4f level crossing in palladium-like ions and its effect on metastable states

被引：12

作者：

Kimura, Naoki ^{[1
]}

Kodama, Ryunosuke ^{[2
]}

Priti ^{[2
]}

Numadate, Naoki ^{[2
,3
]}

Suzuki, Kento ^{[2
]}

Monobe, Masashi ^{[2
]}

Nakamura, Nobuyuki ^{[2
]}

机构：

[1] RIKEN, Atom Mol & Opt Phys Lab, Saitama 3510198, Japan

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

[3] Univ Tokyo, Komaba Inst Sci, Tokyo 1538902, Japan

来源：

PHYSICAL REVIEW A | 2020年 / 102卷 / 03期

关键词：

ELECTRON-IMPACT EXCITATION; RESONANCE LINES; COULOMB CRYSTALLIZATION; SPECTRA; FE; SPECTROSCOPY; IODINE;

D O I：

10.1103/PhysRevA.102.032807

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the level structures of palladium-like I7+ (Z = 53) and Ba10+ (Z = 56) and the behavior of their metastable states with an electron beam ion trap. The difference in the level structures between I7+ and Ba10+ arising from the configuration crossing between 4d(-1)5p and 4d(-1)4f around the atomic number Z = 56 causes significant differences in the lifetimes of the metastable states. Ba10+ has several long-lived levels (>10(-3) s) in the electron configurations 4d(-1)5s and 4d(-1)4f, whereas the lifetime of the same 4d(-1)4f levels in I7+ is much shorter due to the appearance of deexcitation channels to a lower energy level in 4d(-1)5p. The extreme ultraviolet spectra identified through comparison with theoretical simulations based on a collisional-radiative model evince the level crossing between the 4d(-1)5p and 4d(-1)4f configurations in Ba10+. Additionally, we investigate the ionization processes from the metastable states in palladium-like ions by observing the electron energy dependence of the prominent visible line (4d(-1) : D-2(5/2)-D-2(3/2)) of rhodium-like I8+ and Ba11+. The electron energy dependencies reflecting the properties of the metastable states show a difference between iodine and barium, which can be explained by the populations of the metastable states calculated with theoretical simulations.

引用

页数：10

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