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

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

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Publication Article, peer reviewed scientific
Title Experimental and theoretical lifetimes and transition probabilities for spectral lines in Nb II
Author Nilsson, H. ; Engström, L. ; Lundberg, H. ; Hartman, Henrik ; Palmeri, P. ; Quinet, P.
Date 2019
English abstract
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.
DOI https://doi.org/10.1051/0004-6361/201935614 (link to publisher's fulltext.)
Publisher EDP Sciences
Host/Issue Astronomy and astrophysics;
Volume 627
ISSN 1432-0746
Language eng (iso)
Subject atomic data
methods: laboratory: atomic
techniques: spectroscopic
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/30119 Permalink to this page
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