EPR evidence for Mg+ions in CaO

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Abstract
An isotropic spectrum with g=1.9776+or-0.0005 and consisting of a main line flanked by six equally intense, equally spaced lines of about 2% of the intensity of the main transition, is observed in calcium oxide crystals irradiated with visible light. This spectrum is attributed to Mg+ ions present in both magnesium-doped CaO and in small concentration as an impurity in ostensibly pure crystals; the six satellite lines are believed to be due to the hyperfine interaction of the 25Mg nucleus of natural abundance 10.5% and I=5/2. The hyperfine constant is found to be A=(32.30+or-0.01)*10-4 cm-1. On the basis of a simple molecular orbital model involving both the Mg(3s) and O(2p) orbitals the measured g-value is accounted for satisfactorily.