Ligand Field Theory Formulation of the Optical and Magnetic Properties of U2 Centres in the Alkali Halides

It is shown that a better theoretical formulation of the properties of the U2 centre in the alkali halides is given in terms of ligand field theory rather than the approach usually adopted, which consists of an application of the techniques employed by Gourary and Adrian [5] in their F‐centre calculations. The general features of the present formulation are discussed in relation to experiment, and future experimental and theoretical investigations suggested which should enable the finer details concerning the validity and usefulness of the approach to be elucidated.