Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dmp..d914f&link_type=abstract
American Physical Society, DAMOP Meeting, 14-June 17, 2000 Storrs, CT, abstract #D9.14
Astronomy and Astrophysics
Astrophysics
Scientific paper
In astrophysics, rare-earth abundances are particularly relevant to the study of chemically peculiar stars, stellar nucleosynthesis, and other problems. Accurate oscillator strengths are required to disentangle blends and obtain reliable abundance values. Rare-earth salts are also used in many commercial metal-halide high intensity discharge lamps. Accurate transition probabilities are required in the models used for lamp design and for diagnostics. We have determined accurate radiative lifetimes for the first three spectra of Lu using time-resolved laser-induced fluorescence on a slow beam of Lu ions and atoms. Lu I branching fractions have been determined from an emission spectra taken with a 1.0 m Fourier transform spectrometer at the National Solar Observatory (NSO). These are combined with the radiative lifetimes to produce 38 accurate transition probabilities for Lu I. The Lu I measurements are compared to new relativistic Hartree-Fock calculations.
Biémont É.
Den Hartog Elizabeth A.
Fedchak J. A.
Lawler James E.
Palmeri Patrick
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