Abstract
centres in and are strongly coupled Jahn-Teller systems. A theoretical Jahn-Teller model is developed, in which the parameters that appear in the effective Hamiltonian describing the ground state of the ion are obtained by fitting previously published EPR results. It is found necessary to include certain random strains in the analysis in order to explain the orthorhombic features of the EPR spectra. The coupling between the ground and excited states and the effects of other perturbations are discussed.
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