Configuration interaction in rare-earth ions. I. Three particle correlation in Pr2+

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Abstract
Coulomb matrix elements are obtained for configuration interaction processes in Pr2+ and Pr3+, using Hartree-Fock-Slater wave functions. Second order perturbation theory is used to calculate the six parameters which characterize the effective three-particle operator for Pr2+. The results are compared with parameters obtained in a recent analysis of experimental data. 4f to nh processes are shown to be negligible; the contributions due to 4f to nf processes are calculated to within 20% of their true values; higher order perturbation terms are shown to be necessary for an adequate determination of the contributions due to the 4f to or from np processes.

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