Rydberg series and the first ionization potential of platinum and yttrium atoms

Rydberg spectra of platinum and yttrium atoms have been studied by the atomic beam double-resonance pulsed-field ionization detection technique. Five Rydberg series of platinum, 5d9nd 5/2[1/2]1, 5d9nd 5/2[3/2]1,2, 5d9nd 5/2[5/2]2,3, 5d9nd 5/2[7/2]3 and 5d9ns 5/2[5/2]2,3, and three Rydberg series of yttrium, 5s2nd 2D3/2, 5s2nd 2D5/2 and 5s2ns 2S1/2, converging to the ground states of Pt+ (5d92D5/2) and Y+ (5s21S0), respectively, have been observed and analysed. The first ionization potentials of platinum and yttrium atoms have been determined to be IPPt=72 257.8±0.8 cm-1 and IPY=50 146.6±0.8 cm-1, respectively. Several unidentified lines in the spectrum of yttrium have also been observed. (author)