We report an ESR investigation of a S = 1 2 center in MgO, CaO and SrO consisting of an O-ion neighbored by a substitutional Li+ion. The center is identified by comparison with the isomorphous centers in ZnO and BeO and with the analogous V1, VOHand VFcenters in the alkaline earth oxides. The hyperfine interaction with the Li nucleus contains a negative contact part. The interpretaion of the g⊥-shifts and of the anisotropic part of the hf interaction shows that Li+and O-relax away from each other. In MgO and CaO a lithium isotopic shift of g⊥is observed. The trapped hole is localized predominantly at one oxygen ion, as is demonstrated by a discussion of the g¶-shifts. © 1971.
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