Pairwise interaction method in crystal field theory

The authors describe a new variant of crystal field theory - the pairwise interaction method. The pairwise interaction method is a superposition variant of crystal field theory in which as the parameters they use the shifts in the one-electron orbital energy levels of the inner Z-electron under the action of the perturbation caused by a single ligand. They establish a relationship between the pair-wise interaction method parameters and parameters of the angular overlap model and classical crystal field theory. They present tables allowing them to consider (in the weak crystal field approximation) the complexes ML6, MO8 (Oh), and ML4 (Td) with integral and half-integral values of J for the central atom (≤ 6), and also the octahedral complex in the case of an intermediate crystal field for integral J ≤ 6