SPECTROSCOPIC DATA FOR THE 6S6P P-3(1) LEVEL OF LU+ FOR THE DETERMINATION OF THE SOLAR LUTETIUM ABUNDANCE

We report spectroscopic measurements on the 6s6p P-3(i) level of Lu+ a t 28503.16 cm(-1). The radiative lifetime of this level was measured t o be 37.4 +/- 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 Nationa l Solar Observatory. The log(gf) values determined by combining the ra diative lifetime and branching fractions for the lambda 3507.39, lambd a 5983.90, and lambda 6221.87 (air wavelengths) lines are -1.16 +/- 0. 03, -1.16 +/- 0.06, and -0.76 +/- 0.04, respectively. The lambda 6221. 87 line has been identified by Bord, Cowley, and Mirijanian (1997) as the best candidate for the determination of the solar lutetium abundan ce because it is only slightly blended in the solar spectrum. The pres ent lambda 6221.87 transition probability measurement brings their sol ar lutetium abundance into good agreement with the CI chondrite abunda nce.