Article (Scientific journals)
Lifetime measurements and oscillator strengths in singly ionized scandium and the solar abundance of scandium
Rhodin, A. P.; Belmonte, M. T.; Engström, L. et al.
2017In Monthly Notices of the Royal Astronomical Society, 472 (3), p. 3337-3353
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Keywords :
Atomic data; Methods: laboratory: atomic; Methods: numerical; Sun: abundances; Techniques: spectroscopic
Abstract :
[en] 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 timeresolved 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 log∈⊙ = 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 (log∈met = 3.05 ± 0.02) of Lodders, Palme & Gail. © 2017 The Authors.
Disciplines :
Physics
Author, co-author :
Rhodin, A. P.;  Lund Observatory, Lund University, PO Box 43, Lund, SE-221 00, Sweden, Materials Science and Applied Mathematics, Malmö University, Malmö, SE-205 06, Sweden
Belmonte, M. T.;  Physics Department, Blackett Laboratory, Imperial College London, London, SW7 2BZ, United Kingdom
Engström, L.;  Department of Physics, Lund Institute of Technology, PO Box 118, Lund, SE-221 00, Sweden
Lundberg, H.;  Department of Physics, Lund Institute of Technology, PO Box 118, Lund, SE-221 00, Sweden
Nilsson, H.;  Lund Observatory, Lund University, PO Box 43, Lund, SE-221 00, Sweden
Hartman, H.;  Lund Observatory, Lund University, PO Box 43, Lund, SE-221 00, Sweden, Materials Science and Applied Mathematics, Malmö University, Malmö, SE-205 06, Sweden
Pickering, J. C.;  Physics Department, Blackett Laboratory, Imperial College London, London, SW7 2BZ, United Kingdom
Clear, C.;  Physics Department, Blackett Laboratory, Imperial College London, London, SW7 2BZ, United Kingdom
Quinet, Pascal  ;  Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids
Fivet, V.;  Physique Atomique et Astrophysique, Université de Mons-UMONS, 20 Place du Parc, Mons, B-7000, Belgium
Palmeri, P.;  Physique Atomique et Astrophysique, Université de Mons-UMONS, 20 Place du Parc, Mons, B-7000, Belgium
Language :
English
Title :
Lifetime measurements and oscillator strengths in singly ionized scandium and the solar abundance of scandium
Publication date :
2017
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press
Volume :
472
Issue :
3
Pages :
3337-3353
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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