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

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

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

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 base (Kurucz 2011).

Original languageEnglish
Pages (from-to)532-540
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume471
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Atomic data
  • Atomic processes
  • Methods: numerical

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