Radiative lifetime and oscillator strength determinations in Sm III

Details Radiative lifetime and oscillator strength determinations in Sm III Radiative lifetime and oscillator strength determinations in Sm III

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..343b&link_type=abstract

Astronomy and Astrophysics, v.399, p.343-349 (2003)

Astronomy and Astrophysics

Astrophysics

9

Atomic Processes, Atomic Data, Stars: Chemically Peculiar

Scientific paper

Radiative lifetimes of 6 levels belonging to the 4f5(6Hdeg, 6Fdeg)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 6Fdeg as a parent term. Larger discrepancies (53 and 37%) are observed for 2 levels with 6Hdeg and 6Fdeg, 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.

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