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

H. Nilsson; L. Engström; H. Lundberg; H. Hartman; P. Palmeri; P. Quinet

doi:10.1051/0004-6361/201935614

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

H. Nilsson, L. Engström, H. Lundberg, H. Hartman, P. Palmeri, P. Quinet

Atomic Physics

Research output: Contribution to journal › Article › peer-review

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 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.

Original language	English
Article number	A102
Journal	Astronomy and Astrophysics
Volume	627
DOIs	https://doi.org/10.1051/0004-6361/201935614
Publication status	Published - 2019 Jul

Subject classification (UKÄ)

Atom and Molecular Physics and Optics

Free keywords

Atomic data
Methods: laboratory: atomic
Techniques: spectroscopic

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10.1051/0004-6361/201935614

Cite this

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title = "Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII",

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 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.",

keywords = "Atomic data, Methods: laboratory: atomic, Techniques: spectroscopic",

author = "H. Nilsson and L. Engstr{\"o}m and H. Lundberg and H. Hartman and P. Palmeri and P. Quinet",

year = "2019",

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doi = "10.1051/0004-6361/201935614",

language = "English",

volume = "627",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - Experimental and theoretical lifetimes and transition probabilities for spectral lines in NbII

AU - Nilsson, H.

AU - Engström, L.

AU - Lundberg, H.

AU - Hartman, H.

AU - Palmeri, P.

AU - Quinet, P.

PY - 2019/7

Y1 - 2019/7

N2 - 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.

AB - 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.

KW - Atomic data

KW - Methods: laboratory: atomic

KW - Techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=85069513869&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201935614

DO - 10.1051/0004-6361/201935614

M3 - Article

AN - SCOPUS:85069513869

SN - 0004-6361

VL - 627

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A102

ER -

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

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