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Lego Figure holding a lego telescope. Photo

Henrik Hartman

Researcher (Leave of Absence)

Lego Figure holding a lego telescope. Photo

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

Author

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

Summary, in English

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).

Department/s

  • Atomic Physics
  • Lund Observatory

Publishing year

2017-01-01

Language

English

Pages

532-540

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

471

Issue

1

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Atomic data
  • Atomic processes
  • Methods: numerical

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711