Abstract
We set out the effective Hamiltonian associated with the application of perturbations such as stress to ions in surroundings of cubic or tetrahedral symmetry that are subject to a T(X) tau 2 Jahn-Teller interaction. The first- and second-order Ham factors that appear as parameters in this effective Hamiltonian are calculated by a numerical method, and checked by approximate analytical methods in the limits of strong and weak coupling. The results are compared with those produced by an approximate analytical method by Jamila and co-workers. Some discrepancies are found.
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