Abstract
ODMR measurements via the magnetic circular polarization of the emission (MCPE) of F A(Mg) centres in CaO at 1.6 K showed besides the known F A-ODMR lines a non zero MCPE, which vanishes at g ≅ 2. From the dynamical behaviour of this MCPE and the F A luminescence is shown that an electron tunneling takes place from the excited T 1u F centre state to F + A centres forming excited F A centres. The ground state back tunneling rate is 10 7 times smaller and cannot explain the observed electron transfer cycle. The back tunneling is also going via excited states. The results can be understood assuming a random centre distribution. A new luminescence band at 785 nm could be identified by ODMR as being due to tetragonal F AA centres. The electron transfer is also observed between F and F + and F + AA centres.
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