Abstract

General effects resulting from the dynamic Jahn-Teller interaction on the single cubic symmetry T 2 orbital state, which in C3v forms a basis for the A 1 + E symmetry representations, are investigated. As a result of the discussion of the types of centre in various host lattices which are likely to exhibit these effects, we are led to consider the centre responsible for the ‘self-activated emission’ in II–VI semiconductors. It is shown that a combination of theory with the experimental E.S.R. and optical polarization data strongly suggests that a dynamic Jahn-Teller interaction is occurring in these centres.

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