Article (Scientific journals)
Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII
Nilsson, H.; Engström, L.; Lundberg, H. et al.
2019In Astronomy and Astrophysics, 627, p. 102
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Keywords :
Atomic data; Methods: laboratory: atomic; Techniques: spectroscopic; Fourier transform infrared spectroscopy; Laser excitation; Niobium compounds; Spectrometers; Fourier transform spectrometers; Hollow cathode discharge; Methods: laboratory; Relativistic Hartree-Fock methods; Time-resolved laser-induced fluorescence; Transition probabilities; Probability
Abstract :
[en] 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 4d3(4F)5d and 4d3(4F)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. © ESO 2019.
Disciplines :
Physics
Author, co-author :
Nilsson, H.;  Lund Observatory, Lund University, Box 43, Lund, 22100, Sweden
Engström, L.;  Department of Physics, Lund University, Box 118, Lund, 22100, Sweden
Lundberg, H.;  Department of Physics, Lund University, Box 118, Lund, 22100, Sweden
Hartman, H.;  Lund Observatory, Lund University, Box 43, Lund, 22100, Sweden, Materials Science and Applied Mathematics, Malmö University, Malmö, 20506, Sweden
Palmeri, P.;  Physique Atomique et Astrophysique, Université de Mons, Mons, 7000, Belgium
Quinet, Pascal  ;  Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids
Language :
English
Title :
Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII
Publication date :
2019
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
627
Pages :
A102
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Sverige Vetenskapsrådet [SE]
KAW - Knut och Alice Wallenbergs Stiftelse [SE]
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