A novel pulsed ion source suitable for laser spectroscopy on any metallic element is described. The source is based on a large-bore low-pressure hollow-cathode discharge. The first direct radiative lifetime measurements in Nb II are reported. Radiative lifetimes for z⁵G and z³D levels of Nb II are determined using time-resolved laser-induced fluorescence on a Nb II ion beam.
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Salih et al. (1983) studied this question.
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