Abstract
Abstract A ligand field analysis of intraconfigurational transitions in tetrahedral MnO 4 3− and FeO 4 3− is shown to give rather anomalous B values for the ground state configuration e 2 . A model taking explicit account of interactions between d 2 (ionic) multiplets and singly excited (ligand to metal) charge transfer configurations is used to show that for low charge transfer energies each state of e 2 is modified to a different extent by covalency effects. A full account of all possible charge transfer excitations in comparison with published spectral data allows to deduce a rather important electrostatic component to the multiplet splittings originating from the e 1 t 2 1 (strong field) configuration. This is drawn as an explanation for the considerable success of the ligand field model in describing term energies belonging to such a configuration.
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