ISOTOPE SHIFT INVESTIGATIONS IN THE CONFIGURATIONS 5D(9)NL AND 5D(8)NLN'L' OF PT-I

Abstract

The isotope shift in a platinum hollow cathode discharge was studied for transitions of the type 5d(9)7s --> 5d(9)6p, 5d(9)7s --> 5d(8)6s6p and 5d(9)6p --> 5d(8)6s(2) through laser optogalvanic spectroscopy and high resolution interferometry. Considering configuration mixing in each of the levels of 5d(9)6s, 5d(8)6s(2), 5d(8)6s6p and 5d(9)6p of all known and the new evaluated level isotope shifts, we obtain average configuration isotope shift values for the even configurations Delta T(5d(9)6s) = 2425(90) MHz, Delta T(5d(8)6s(2)) = 5960(60) MHz, Delta T(5d(9)7s) = 260(160) MHz and for the odd configurations Delta T(5d(9)6p) = -230(380) MHz, Delta T(5d(8)6s6p) = 2740(250) MHz, Delta T(5d(7)6s(2)6p) = 9700(4700) MHz. These experimental values compare well with the theoretically predicted configuration isotope shifts in platinum, based on pseudo-relativistic Hartree-Fock calculations.