Abstract

The isotope shift in a platinum hollow cathode discharge was studied for transitions of the type 5d97s → 5d96p, 5d97s → 5d86s6p and 5d96p → 5d86s2 through laser optogalvanic spectroscopy and high resolution interferometry. Considering configuration mixing in each of the levels of 5d96s, 5d86s2, 5d86s6p and 5d96p of all known and the new evaluated level isotope shifts, we obtain average configuration isotope shift values for the even configurations ΔT(5d96s) = 2425 (90) MHz, ΔT(5d86s2) = 5960 (60) MHz, ΔT(5d97s) = 260 (160) MHz and for the odd configurations ΔT(5d96p) = −230 (380) MHz, ΔT(5d86s6p) = 2740 (250) MHz, ΔT(5d76s26p) = 9700 (4700) MHz. These experimental values compare well with the theoretically predicted configuration isotope shifts in platinum, based on pseudo-relativistic Hartree-Fock calculations.

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