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Abstract The terms and levels of the configuration ƒ2, corresponding to Pr3+, are examined. It is shown that it is essential to allow for the breakdown of Russell─Saunders coupling when calculations of the crystal splittings of several excited levels are made. Evidence is given for identifying the level lying immediately above 3F3 as 3F4. The crystal splittings of 3H4, 1G4, 3F3, 3P2 and 3P1 in PrCI3 are satisfactorily accounted for, and the reasons for the deviations between experiment and theory in the case of 1D2 are discussed.
Brian R. Judd (Tue,) studied this question.