Abstract

We measure the radiative lifetimes of 17 levels in Y I with a time-resolved laser-induced fluorescence technique. Of these 17 levels, 13 are reported on for the first time to the best of our knowledge. Branching fractions for 72 lines related to these Y I levels are determined based on the spectra by the Fourier transform spectrometer at the National Solar Observatory (NSO) on Kitt Peak, USA (http://diglib.nso.edu/ftp.html). By combining the results of lifetimes and branching ratios, the transition probabilities ($gA$) and oscillator strengths ($\log (gf)$) of these lines are determined. The radiative parameter results obtained in the present work well enrich the atomic database of neutral yttrium, including the experimental values of 62 lifetimes and the $gA$ and $\log (gf)$) of 438 transitions.

© 2018 Optical Society of America

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