Radiative Lifetimes and Atomic Transition Probabilities for Rare-Earth Elements

Details Radiative Lifetimes and Atomic Transition Probabilities for Rare-Earth Elements Radiative Lifetimes and Atomic Transition Probabilities for Rare-Earth Elements

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..gecjtp204d&link_type=abstract

American Physical Society, Gaseous Electronics Conference, October 5-9, 1997, abstract #JTP.204

Astronomy and Astrophysics

Astrophysics

Scientific paper

Interest in rare-earth elements has been on the rise in recent years in both the lighting and astrophysics communities. The lighting industry is increasingly using rare-earths in high-intensity discharge (HID) lamps and require comprehensive sets of accurate oscillator strengths for the modelling of these lamps. Spectroscopic data on rare-earths is also needed in astrophysical studies such as those dealing with the evolution of chemically-peculiar stars. The present work is addressing this need with extensive radiative lifetime and branching fraction measurements, which when combined will yield a large database of absolute transition probabilities of the elements thulium, dysprosium, and holmium. Radiative lifetimes are measured using laser-induced fluorescence of a slow atomic/ionic beam. Branching fractions are determined from spectra recorded using the 1.0 meter Fourier-transform spectrometer at the National Solar Observatory. Lifetimes for 298 levels of Tm I and Tm II and 440 levels of Dy I and Dy II are complete. Branching fractions have been measured for 522 transitions of Tm I and Tm II. Work is underway on lifetimes of Ho and branching fractions of Dy. Representative lifetime and branching fraction data will be presented and discussed.

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