Imperial College London
Alternate

Professor Juliet C Pickering

Faculty of Natural Sciences, Department of Physics

Professor of Experimental Physics
 
 
 
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Contact

 

+44 (0)20 7594 7763j.pickering Website

 
 
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Location

 

706Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rhodin:2017:mnras/stx2159,
author = {Rhodin, AP and Belmonte, MT and Engstrom, L and Lundberg, H and Nilsson, H and Hartman, H and Pickering, JC and Clear, C and Quinet, P and Fivet, V and Palmeri, P},
doi = {mnras/stx2159},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {3337--3353},
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},
volume = {472},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The lifetimes of 17 even-parity levels (3d5s, 3d4d, 3d6s and 4p2) in the region57 743–77 837 cm−1 of singly ionized scandium (Sc II) were measured by two-step timeresolvedlaser induced fluorescence spectroscopy. Oscillator strengths of 57 lines from thesehighly excited upper levels were derived using a hollow cathode discharge lamp and a Fouriertransform spectrometer. In addition, Hartree–Fock calculations where both the main relativisticand core-polarization effects were taken into account were carried out for both low- andhigh-excitation levels. There is a good agreement for most of the lines between our calculatedbranching fractions and the measurements of Lawler & Dakin in the region 9000–45 000 cm−1for low excitation levels and with our measurements for high excitation levels in the region23 500–63 100 cm−1. This, in turn, allowed us to combine the calculated branching fractionswith the available experimental lifetimes to determine semi-empirical oscillator strengths fora set of 380 E1 transitions in Sc II. These oscillator strengths include the weak lines that wereused previously to derive the solar abundance of scandium. The solar abundance of scandiumis now estimated to log = 3.04 ± 0.13 using these semi-empirical oscillator strengths toshift the values determined by Scott et al. The new estimated abundance value is in agreementwith the meteoritic value (logmet = 3.05 ± 0.02) of Lodders, Palme & Gail.
AU  - Rhodin,AP
AU  - Belmonte,MT
AU  - Engstrom,L
AU  - Lundberg,H
AU  - Nilsson,H
AU  - Hartman,H
AU  - Pickering,JC
AU  - Clear,C
AU  - Quinet,P
AU  - Fivet,V
AU  - Palmeri,P
DO  - mnras/stx2159
EP  - 3353
PY  - 2017///
SN  - 0035-8711
SP  - 3337
TI  - Lifetime measurements and oscillator strengths in singly ionized scandium and the solar abundance of scandium
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stx2159
UR  - http://hdl.handle.net/10044/1/56466
VL  - 472
ER  -
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