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The energies of the 37 observed levels of the 4f3 configuration of Pr iii have been calculated with an rms deviation of ±29 cm−1 by use of 13 adjustable parameters, including 5 parameters which account for nonlinear configuration-interaction effects. The physical significance of the nonlinear parameters is discussed in terms of the relative roles of various mechanisms of configuration interaction.
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K. Rajnak (1965) studied this question.
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