RADIATIVE LIFETIMES IN NI-I

New radiative lifetime measurements based on time-resolved laser-induc ed fluorescence are reported for 57 odd-parity and 9 even-parity level s of Ni I, ranging in energy from 29000 to 57000 cm-1. Our lifetimes a gree with earlier measurements based on laser-induced fluorescence but are much more extensive than earlier laser measurements. These lifeti mes are found to agree with the recent critical compilation of atomic transition probabilities from the U.S. National Bureau of Standards [J . Phys. Chem. Ref. Data 17, Suppl. 4 (1988)]. These lifetimes are also compared with lifetimes derived from the highly accurate (+/-0.7%) re lative oscillator strengths measured by the Oxford group [Mon. Not. R. Astron. Soc. 236, 235 (1989)]. Our lifetimes provide an improved (+/- 2%) absolute scale for the Oxford measurements.