Analysis of the Spectra of Trivalent Promethium and Holmium

Abstract
The spin‐orbit matrices for the f 4 configuration have been calculated and checked. These have been applied to the analysis of the solid‐state spectra of trivalent promethium and holmium. A tentative energy‐level scheme for promethium is obtained. In the case of holmium, all levels below 27 000 cm—1 have been identified, including two levels hitherto unreported in the solid state, at 25 900 cm—1 and 26 190 cm—1, and a root mean‐square deviation between calculated and observed energies of 96 cm—1 is achieved. Values of the Landé splitting factor g are predicted for the holmium levels.

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