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Doubly ionized thorium: Laser lifetime measurements and transition probability determination of interest in cosmochronology

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Author

Summary, in English

The first lifetime measurements have been performed for six levels of doubly ionized thorium, an important cosmochronometer in astrophysics for estimating the age of the Galaxy. The levels, belonging to the 5f(2), 5f7p, 7s7p, and 6d7p configurations of Th III, have been measured by the time-resolved laser-induced fluorescence method and compared with relativistic Hartree-Fock calculations including configuration interaction and core-polarization effects. Taking advantage of the excellent agreement between theory and experiment, a first set of transition probabilities of astrophysical interest has been deduced for this ion from a combination of the experimental lifetimes and of the theoretical branching fractions.

Department/s

Publishing year

2002

Language

English

Pages

1276-1283

Publication/Series

Astrophysical Journal

Volume

567

Issue

2

Document type

Journal article

Publisher

American Astronomical Society

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • atomic data
  • methods : laboratory
  • peculiar
  • stars :
  • line : identification

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X