Experimental and theoretical radiative lifetimes, branching fractions, transition probabilities, and oscillator strengths of NBI levels

Radiative lifetimes for 60 odd-parity levels of Nb I belonging to the 4d35s5p and 4d45p configurations, except for two levels with unknown configuration, which are in the energy range between 23,910.90 and 37,188.28 cm−1, are measured by the time-resolved laser-induced fluorescence technique. The lifetime values range from 7.1 to 118.7 ns with uncertainties less than 10%. To our knowledge, 45 lifetime values determined in this paper are reported for the first time. By combining the experimental lifetimes with measured or computed branching fractions, we obtain transition probabilities and oscillator strengths for the individual channels depopulating the investigated levels. © 2019. The American Astronomical Society. All rights reserved.