Absorption Spectrum of Pu3+ in Lanthanum Trichloride and Lanthanum Ethylsulfate

Abstract

The polarized absorption spectrum and some Zeeman effect studies were conducted on crystals of lanthanum trichloride and lanthanum ethylsulfate containing 0.1 and 5 mole % of Pu³⁺ at various low temperatures. The ground‐state levels as well as several excited states are well characterized. Attempts at fitting the positions of levels to 5f hydrogenic free‐ion states give good agreement for F₂=245 cm^—1 and ζ=2290 cm^—1.