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Racah parameters are a set of parameters used to describe the energies of the electronic terms of transition-metal ions, particularly those having more than one d electron. They provide a convenient way of expressing the interelectronic repulsion between d electrons. The three important Racah parameters are A, B and C. The parameter A represents the average energy of interelectronic repulsion and is common to all terms arising from a particular electron configuration. Therefore, differences in term energies are independent of A. Parameters B and C describe the differential interelectronic repulsion and are related to the distribution of electrons among the different d orbitals. For a free ion, the values of _________ ______ ____ _______ _______ ______ __________.
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