Expressions are given for the configuration interaction contributions to the correlation crystal field in lanthanide ions. Contributions to the parameters B 0 K (LL) are calculated for the system Pr 3+ -Cl - . Wavefunctions derived from a modified Hartree-Fock potential are used, with excited states up to n=18 and l=5. The results obtained show that configuration interaction gives reductions in the Slater parameters as well as a significant term dependence of the quadrupole crystal-field parameters, mainly due to an L-dependent radial expansion of the Pr 3+ 4f wavefunction.
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Copland et al. (1978) studied this question.
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