Volume 399, Number 1, February III 2003
|Page(s)||343 - 349|
|Section||Atomic, molecular, and nuclear data|
|Published online||05 February 2003|
Radiative lifetime and oscillator strength determinations in Sm III
Astrophysique et Spectroscopie, Université de Mons-Hainaut, 7000 Mons, Belgium
2 IPNAS (Bât. B15), Université de Liège, Sart Tilman, 4000 Liège, Belgium
3 Lund Observatory, Box 43, Lund University, 221 00 Lund, Sweden
4 Department of Physics, Lund Institute of Technology, PO Box 118, 221 00 Lund, Sweden
Accepted: 22 November 2002
Radiative lifetimes of 6 levels belonging to the 4f5(6H°, 6F°)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 6F° as a parent term. Larger discrepancies (53 and 37%) are observed for 2 levels with 6H° and 6F°, 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.
Key words: atomic processes / atomic data / stars: chemically peculiar
© ESO, 2003
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