Transition Probabilities in the First Spectra of Niobium, Rhodium, Hafnium, Tantalum, and Tungsten
Transition probabilities of 1191 spectral lines in the first spectra of Nb, Rh, Hf, Ta and W are determined by accurate measurements of radiative lifetimes and branching ratios. The lifetimes are measured by the time-resolved laser-induced fluorescence on an atomic beam. The atomic beam source is a low-pressure, large-bore hollow cathode discharge. Branching ratios are measured from intensity -calibrated hollow cathode emission spectra recorded with the one-meter Fourier Transform Spectrometer at Kitt Peak National Observatory. The emission spectra cover the spectral region from 300 nm to 2500 nm and contain all important branches from all of the atomic levels studied. The uncertainty in the final transition probabilities is 5% to 10% for most spectral lines that are greater than 5% branches.
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- Physics: Atomic