Absorption Spectrum of PuCl3

Abstract
The absorptionspectrum of thin films of PuCl3 was measured at 298, 77, and 4°K in the range 6000–34 000 cm−1. Results were compared to earlier work in LaCl3 :Pu3+, and a number of new assignments were made. Electrostatic, spin–orbit, and configuration‐interaction parameters were obtained by direct diagonalization of the energy matrix and a least‐squares fitting process to 30 observed levels. The variations in certain energy‐level parameters within the actinide series is discussed. Intensity calculations gave only moderate agreement with oscillator strengths of observed bands.