The thermodynamic data for the lanthanide and actinide metals have been combined with spectroscopic data to develop a method of estimating the energies of the electronic configurations of the neutral gaseous atoms. Energies are tabulated for the lowest spectroscopic level of each configuration. Many of the odd terms of La I have been reclassified.
LEO BREWER, "Energies of the Electronic Configurations of the Lanthanide and Actinide Neutral Atoms," J. Opt. Soc. Am. 61, 1101-1111 (1971)