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Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII

Nilsson, H. LU ; Engström, L. LU ; Lundberg, H. LU ; Hartman, H. LU ; Palmeri, P. and Quinet, P. (2019) In Astronomy and Astrophysics 627.
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 4d3(4F)5d and 4d3(4F)6s subconfigurations, at an energy around... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atomic data, Methods: laboratory: atomic, Techniques: spectroscopic
in
Astronomy and Astrophysics
volume
627
publisher
EDP Sciences
external identifiers
  • scopus:85069513869
ISSN
0004-6361
DOI
10.1051/0004-6361/201935614
language
English
LU publication?
yes
id
ea3fc08c-8aaf-44d8-8f29-aa33c56ccc39
date added to LUP
2019-08-06 09:24:16
date last changed
2019-08-28 04:57:49
@article{ea3fc08c-8aaf-44d8-8f29-aa33c56ccc39,
  abstract     = {<p>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<sup>3</sup>(<sup>4</sup>F)5d and 4d<sup>3</sup>(<sup>4</sup>F)6s subconfigurations, at an energy around 70 000 cm<sup>-1</sup>. By combining the lifetimes with experimental branching fractions absolute transition probabilities of 59 lines are derived. The experimental results are compared with calculated values.</p>},
  articleno    = {A102},
  author       = {Nilsson, H. and Engström, L. and Lundberg, H. and Hartman, H. and Palmeri, P. and Quinet, P.},
  issn         = {0004-6361},
  keyword      = {Atomic data,Methods: laboratory: atomic,Techniques: spectroscopic},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy and Astrophysics},
  title        = {Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII},
  url          = {http://dx.doi.org/10.1051/0004-6361/201935614},
  volume       = {627},
  year         = {2019},
}