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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 f^2 configuration. Excellent agreement was found with the experimentally observed values of Pr IV.
F. H. Spedding (Thu,) studied this question.
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