Abstract
The absorption spectrum 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.
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