Experimental and theoretical lifetimes and transition probabilities for spectral lines in Nb II

被引：1

作者：

Nilsson, H. ^{[1
]}

Engstrom, L. ^{[2
]}

Lundberg, H. ^{[2
]}

Hartman, H. ^{[1
,3
]}

Palmeri, P. ^{[4
]}

Quinet, P. ^{[4
,5
]}

机构：

[1] Lund Univ, Lund Observ, Box 43, S-22100 Lund, Sweden

[2] Lund Univ, Dept Phys, Box 118, S-22100 Lund, Sweden

[3] Malmo Univ, Mat Sci & Appl Math, S-20506 Malmo, Sweden

[4] Univ Mons, Phys Atom & Astrophys, B-7000 Mons, Belgium

[5] Univ Liege, IPNAS, B-4000 Liege, Belgium

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 627卷

基金：

瑞典研究理事会;

关键词：

atomic data; methods: laboratory: atomic; techniques: spectroscopic; OSCILLATOR-STRENGTHS; RADIATIVE LIFETIMES;

D O I：

10.1051/0004-6361/201935614

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We have measured and calculated lifetimes of high lying levels in Nb II, and derived absolute transition probabilities by combining the lifetimes with experimental branching fractions. Methods. The lifetimes were measured using time-resolved laser-induced fluorescence in a two-photon and two-step excitation scheme. The branching fractions were measured in intensity calibrated spectra from a hollow cathode discharge, recorded with a Fourier transform spectrometer. The calculations were performed with the relativistic Hartree-Fock method including core polarization. Results. We report experimental lifetimes of 13 levels in the 4d(3)(F-4)5d and 4d(3)(F-4)6s subconfigurations, at an energy around 70 000 cm(-1). By combining the lifetimes with experimental branching fractions absolute transition probabilities of 59 lines are derived. The experimental results are compared with calculated values.

引用

页数：7

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