Following the methods outlined in Condon and Shortley's Theory of Atomic Spectra, the energy states of praseodymium IV were calculated. It was assumed in the solid and liquid phases that the sharp absorption spectrum would arise from transitions within the incomplete $4f$ shell, in other words from states arising from the f² configuration. Excellent agreement was found with the experimentally observed values of Pr IV.
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F. H. Spedding (1940) studied this question.
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