Odmr of cd impurity centers in gg irradiated baf2 crystals

The magnetic circular dichroism of the optical absorption (MCD), optically detected magnetic resonance (ODMR) as well as ESR and luminescence in Cd-doped BaF2 crystals 7-irradiated at RT were investigated. MCD signals centered at 295 nm, 290 nm and 365 nm are observed, together with corresponding radiation induced optical absorption bands in the same wavelength regions. The ODMR detected in all these bands is caused by hyperfine (hf) interaction of unpaired spin with Cd-nucleus. Three types of different Cd-related defects have been separated: 1) Cd+c represented by the MCD of derivative type centered at 295 nm and hf constant ACd — 480 mT, 2) Cd+c-center having lowered symmetry of the nearest neighbours and represented by derivative-type MCD centered at 290 nm and Acd = 370 mT. The nature of perturbation is not clear yet. The ESR spectrum of perturbed Cd+c-center significantly differs from that of the regular Cd+c-center. 3) Center represented by the MCD around 365 nm and the hf constant ACd = 380 mT which is attributed to Cd+(l) type center.