Abstract
WE have been engaged for some time upon the study of the fine structures of thirty-three lines of the arc spectrum of platinum in the region 6800–4320. We find that the odd isotope, 195, has a nuclear spin of ½, and that all the terms observed by us exhibit regular even isotope displacement, the lightest isotope lying deepest. The approximate abundance ratios of the four observed isotopes, 198, 196, 195, 194, are 1: 4: 4: 5. Jaeckel and Kopfermann1 have just recently published fine structure measurements of 46 Pt I lines in the region 5900–2350. They also find that the spin of 195 is ½ and report the values of the even isotope displacements in 27 terms. Eight of the lines measured by J. and K. are amongst those studied by us and both sets of measurements are in good agreement.
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