Spectroscopic Data for the 6it s6it p super(3) P sub(1) level of Lu super(+) for the Determination of the Solar Lutetium Abundance

We report spectroscopic measurements on the 6s6p super(3)P sub(1) level of Lu super(+) at 28503.16 cm super(-1). The radiative lifetime of this level was measured to be 37.4 c 1.9 ns using time-resolved laser-induced fluorescence of a slow ion beam. Branching fractions were determined from Lu spectra recorded using the 1.0 m Fourier transform spectrometer at the National Solar Observatory. Thelog(gf) values determined by combining the radiative lifetime and branching fractions for the l3507.39,l 5983.90, and l6221.87 (air wavelengths) lines are - 1.16 c 0.03, - 1.16 c 0.06, and -0.76 c 0.04, respectively. Thel 6221.87 line has been identified by Bord, Cowley, and Mirijanian (1997) as the best candidate for the determination of the solar lutetium abundance because it is only slightly blended in the solar spectrum. The present l6221.87 transition probability measurement brings their solar lutetium abundance into good agreement with the CI chondrite abundance.