Abstract
Accurate branching ratios and absolute transition probabilities for 320 lines in NbI and 187 lines in HfI are reported. A technique is developed for testing the completeness of emission branching ratios and, if necessary, determining the total transition probability of unknown infrared (IR) branches. The technique is based on a comparison of non-IR fluorescence produced by laser excitation to two upper levels from the same lower level. There are no important IR branches beyond 1.0 μm from any of the NbI levels studied. Several HfI levels show strong IR branches that account for most of the radiative decay from these levels.
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