Energy levels of neutral platinum (Pt I)

Abstract

\nThe emission spectrum of a platinum hollow cathode lamp has been recently recorded by means of a grating spectrograph at the National Institute of Standards and Technology (N.I.S.T.) and by Fourier transform spectrometry at Kitt Peak National Observatory and at Laboratoire Aimé Cotton. The classification of Pt I lines is revised and extended. One hundred-nineteen new energy levels have been added to the 83 earlier ones, four of which are assigned revised $J$-values. Seventy percent of the levels are interpreted theoretically by means of Slater-Condon type calculations of (5d + 6s)$^{10}$, 5d$^9$6d, 5d$^9$7s, 5d$^9$7d, 5d$^9$8s and (5d$^9$6p + 5d$^8$6s6p + 5d$^7$6s$^2$6p + 5d$^9$7p). The ionisation limit 5d$^9$ \n $^2$D$_{5/2}$ at $72~230\\pm 50$ cm$^{-1}$ ($8.956\\pm 0.006$ eV) has been derived from 5d$^9$ns, 5d$^9$6f and 5d$^8$6s5f levels.\n