Article (Scientific journals)
Radiative lifetime and oscillator strength determinations in SmIII
Biémont, Emile; Garnir, Henri-Pierre; Litzen, U. et al.
2003In Astronomy and Astrophysics, 399 (1), p. 343-349
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Keywords :
atomic processes; atomic data; stars : chemically peculiar
Abstract :
[en] Radiative lifetimes of 6 levels belonging to the 4f(5)((6)Hdegrees, (6)Fdegrees)5d configuration of Sm III have been measured for the first time using a time-resolved laser-induced fluorescence technique. Experimental data have been compared with semi-empirical calculations. The agreement is excellent for 4 levels with (6)Fdegrees as a parent term. Larger discrepancies (53 and 37%) are observed for 2 levels with (6)Hdegrees and (6)Fdegrees, respectively, as a parent term and are explainable by strong mixing and cancellation effects occurring in the line strength calculations which are responsible of "instabilities" occurring in the lifetimes considered as a function of J value within the term. Branching ratios for the lines depopulating the levels of interest have been measured by Fourier transform spectroscopy. A first set of oscillator strengths has been deduced for this ion.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Biémont, Emile ;  Université de Liège - ULiège > Département de physique > Physique nucléaire, atomique et spectroscopie
Garnir, Henri-Pierre ;  Université de Liège - ULiège > Département de physique > Physique nucléaire
Litzen, U.
Nielsen, K.
Quinet, Pascal  ;  Université de Liège - ULiège > Département de physique > Physique nucléaire, atomique et spectroscopie
Svanberg, S.
Wahlgren, G. M.
Zhang, Z. G.
Language :
English
Title :
Radiative lifetime and oscillator strength determinations in SmIII
Publication date :
February 2003
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
E D P Sciences, Les Ulis Cedexa, France
Volume :
399
Issue :
1
Pages :
343-349
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 March 2010

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