Lifetimes and oscillator strengths for Y III

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Atomic Data, Stars: Chemically Peculiar

Scientific paper

Lifetime measurements, using beam-foil excitation, are reported for doubly charged yttrium, Y III. The experimental data, for 4d-5p, 5s-5p, 5p-6s and 5p-5d transitions, are corroborated by new theoretical calculations using the method of Coulomb Approximation with a Hartree-Slater model core (CAHS). The results provide information about Y III transitions observed in HST spectra of Hg-Mn stars.

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