Radiative lifetime and oscillator strength determinations in Sm III
Författare
Summary, in English
Radiative lifetimes of 6 levels belonging to the4f<SUP>5</SUP>(<SUP>6</SUP>H<SUP>deg</SUP>,<SUP>6</SUP>F<SUP>deg</SUP>)5d configuration of Sm III have beenmeasured for the first time using a time-resolved laser-inducedfluorescence technique. Experimental data have been compared withsemi-empirical calculations. The agreement is excellent for 4 levelswith <SUP>6</SUP>F<SUP>deg</SUP> as a parent term. Larger discrepancies(53 and 37) are observed for 2 levels with <SUP>6</SUP>H<SUP>deg</SUP>and <SUP>6</SUP>F<SUP>deg</SUP>, respectively, as a parent term and areexplainable by strong mixing and cancellation effects occurring in theline strength calculations which are responsible of instabilitiesoccurring in the lifetimes considered as a function of J value withinthe term. Branching ratios for the lines depopulating the levels ofinterest have been measured by Fourier transform spectroscopy. A firstset of oscillator strengths has been deduced for this ion.
Avdelning/ar
Publiceringsår
2003
Språk
Engelska
Sidor
343-349
Publikation/Tidskrift/Serie
Astronomy & Astrophysics
Volym
399
Issue
1
Fulltext
- Available as PDF - 111 kB
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Dokumenttyp
Artikel i tidskrift
Förlag
EDP Sciences
Ämne
- Astronomy, Astrophysics and Cosmology
- Atom and Molecular Physics and Optics
Nyckelord
- atomic processes
- atomic data
- stars: chemically peculiar
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0004-6361