Abstract
The optically detected magnetic resonance spectra of F and F A centres in CaO:Mg show additional narrow lines at g = 2. From the dynamical behaviour of these lines and their microwave power dependence it is shown, that they are due to the magnetic resonance in the ground state of the F + and F + A centres, respectively. This is direct evidence for an electron transfer taking place between the F centre triplet state and the F + A centre ground state. In the same crystal a new luminescence band at 785 nm was found which could be identified by ODMR as being due to a tetragonal F AA centre (i.e. two neighbouring Mg ++ ions replacing Ca ++ on opposite sides of the vacancy). Also to those centres the electron transfer was observed.
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