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Lifetime measurements using two-step laser excitation for high-lying even-parity levels and improved theoretical oscillator strengths in Y II

Palmeri, P. ; Quinet, P. ; Lundberg, H. LU ; Engström, L. LU ; Nilsson, H. LU and Hartman, H. LU orcid (2017) In Monthly Notices of the Royal Astronomical Society 471(1). p.532-540
Abstract

We report new time-resolved laser-induced fluorescence lifetime measurements for 22 highly excited even-parity levels in singly ionized yttrium (Y II). To populate these levels belonging to the configurations 4d6s, 5s6s 4d5d, 5p2, 4d7s and 4d6d, a two-step laser excitation technique was used. Our previous pseudo-relativistic Hartree-Fock model (Biémont et al. 2011) was improved by extending the configuration interaction up to n = 10 to reproduce the new experimental lifetimes. A set of semi-empirical oscillator strengths extended to transitions falling in the spectral range λλ194-3995 nm, depopulating these 22 even-parity levels in Y II, is presented and compared to the values found in the Kurucz's data... (More)

We report new time-resolved laser-induced fluorescence lifetime measurements for 22 highly excited even-parity levels in singly ionized yttrium (Y II). To populate these levels belonging to the configurations 4d6s, 5s6s 4d5d, 5p2, 4d7s and 4d6d, a two-step laser excitation technique was used. Our previous pseudo-relativistic Hartree-Fock model (Biémont et al. 2011) was improved by extending the configuration interaction up to n = 10 to reproduce the new experimental lifetimes. A set of semi-empirical oscillator strengths extended to transitions falling in the spectral range λλ194-3995 nm, depopulating these 22 even-parity levels in Y II, is presented and compared to the values found in the Kurucz's data base (Kurucz 2011).

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atomic data, Atomic processes, Methods: numerical
in
Monthly Notices of the Royal Astronomical Society
volume
471
issue
1
pages
9 pages
publisher
Oxford University Press
external identifiers
  • scopus:85052536714
ISSN
0035-8711
DOI
10.1093/mnras/stx1619
language
English
LU publication?
yes
id
de0c8a63-541b-47d2-9160-04aafa3c85cd
date added to LUP
2018-10-19 12:32:43
date last changed
2025-10-14 12:13:06
@article{de0c8a63-541b-47d2-9160-04aafa3c85cd,
  abstract     = {{<p>We report new time-resolved laser-induced fluorescence lifetime measurements for 22 highly excited even-parity levels in singly ionized yttrium (Y <sub>II</sub>). To populate these levels belonging to the configurations 4d6s, 5s6s 4d5d, 5p<sup>2</sup>, 4d7s and 4d6d, a two-step laser excitation technique was used. Our previous pseudo-relativistic Hartree-Fock model (Biémont et al. 2011) was improved by extending the configuration interaction up to n = 10 to reproduce the new experimental lifetimes. A set of semi-empirical oscillator strengths extended to transitions falling in the spectral range λλ194-3995 nm, depopulating these 22 even-parity levels in Y <sub>II</sub>, is presented and compared to the values found in the Kurucz's data base (Kurucz 2011).</p>}},
  author       = {{Palmeri, P. and Quinet, P. and Lundberg, H. and Engström, L. and Nilsson, H. and Hartman, H.}},
  issn         = {{0035-8711}},
  keywords     = {{Atomic data; Atomic processes; Methods: numerical}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{1}},
  pages        = {{532--540}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Lifetime measurements using two-step laser excitation for high-lying even-parity levels and improved theoretical oscillator strengths in Y <sub>II</sub>}},
  url          = {{http://dx.doi.org/10.1093/mnras/stx1619}},
  doi          = {{10.1093/mnras/stx1619}},
  volume       = {{471}},
  year         = {{2017}},
}