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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 and oscillator strengths in singly ionized scandium and the solar abundance of scandium

Author

  • Asli Pehlivan Rhodin
  • Maria Teresa Belmonte
  • Lars Engström
  • Hans Lundberg
  • Hampus Nilsson
  • Henrik Hartman
  • Juliet Pickering
  • Christian Clear
  • Pascal Quinet
  • Vanessa Fivet
  • Patrick Palmeri
Show all

Summary, in English

The lifetimes of 17 even-parity levels (3d5s, 3d4d, 3d6s and 4p2) in the region 57 743–77 837 cm−1 of singly ionized scandium (Sc ii) were measured by two-step time-resolved laser induced fluorescence spectroscopy. Oscillator strengths of 57 lines from these highly excited upper levels were derived using a hollow cathode discharge lamp and a Fourier transform spectrometer. In addition, Hartree–Fock calculations where both the main relativistic and core-polarization effects were taken into account were carried out for both low- and high-excitation levels. There is a good agreement for most of the lines between our calculated branching fractions and the measurements of Lawler & Dakin in the region 9000–45 000 cm−1 for low excitation levels and with our measurements for high excitation levels in the region 23 500–63 100 cm−1. This, in turn, allowed us to combine the calculated branching fractions with the available experimental lifetimes to determine semi-empirical oscillator strengths for a set of 380 E1 transitions in Sc ii. These oscillator strengths include the weak lines that were used previously to derive the solar abundance of scandium. The solar abundance of scandium is now estimated to logε⊙ = 3.04 ± 0.13 using these semi-empirical oscillator strengths to shift the values determined by Scott et al. The new estimated abundance value is in agreement with the meteoritic value (logεmet = 3.05 ± 0.02) of Lodders, Palme & Gail.

Department/s

  • Lund Observatory - Has been reorganised
  • Atomic Physics

Publishing year

2017

Language

English

Pages

3337-3337

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

472

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966