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

Pehlivan Rhodin, Asli LU ; Belmonte, Maria Teresa ; Engström, Lars LU ; Lundberg, Hans LU ; Nilsson, Hampus LU ; Hartman, Henrik LU orcid ; Pickering, Juliet ; Clear, Christian ; Quinet, Pascal and Fivet, Vanessa , et al. (2017) In Monthly Notices of the Royal Astronomical Society 472(3). p.3337-3337
Abstract
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Monthly Notices of the Royal Astronomical Society
volume
472
issue
3
pages
3353 pages
publisher
Oxford University Press
external identifiers
  • scopus:85052299320
ISSN
1365-2966
DOI
10.1093/mnras/stx2159
language
English
LU publication?
yes
id
14483f1c-ef6a-44aa-a036-d6e1b6f493c2
date added to LUP
2018-02-21 11:35:50
date last changed
2024-04-15 02:29:45
@article{14483f1c-ef6a-44aa-a036-d6e1b6f493c2,
  abstract     = {{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.}},
  author       = {{Pehlivan Rhodin, Asli and Belmonte, Maria Teresa and Engström, Lars and Lundberg, Hans and Nilsson, Hampus and Hartman, Henrik and Pickering, Juliet and Clear, Christian and Quinet, Pascal and Fivet, Vanessa and Palmeri, Patrick}},
  issn         = {{1365-2966}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{3337--3337}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Lifetime measurements and oscillator strengths in singly ionized scandium and the solar abundance of scandium}},
  url          = {{http://dx.doi.org/10.1093/mnras/stx2159}},
  doi          = {{10.1093/mnras/stx2159}},
  volume       = {{472}},
  year         = {{2017}},
}