Isotope shifts and hyperfine structure of Pt i transitions in a hollow-cathode discharge

Abstract

Saturation spectroscopy in a hollow-cathode discharge is used to measure isotope shifts and hyperfine splittings for the 270.24- and 270.59-nm transitions in Pt i. From a systematic analysis of these and other data, the following relative changes in nuclear-charge ratios are derived: 192–190 = 0.8164(45), 194–192 = 0.8997(26), 196–194 = 0.9253(17), 198–196 = 1, and 195–194 = 0.4254(16). An improved value of 63.95(3) mK is also derived for the hyperfine constant A of the 37769-cm−1 state. These constants are also used to assess the accuracy of techniques for extracting centroids, hyperfine constants, and isotope shifts from Fourier-transform spectra.