Infra-red color centres in CdF2

Defect annealing in pure CdF2 crystals

“…An act'ivat>ion energy of 0.34 eV has been measured by us in the same temperature range also in S-irradiated CUF,: G I 3 + . Moreover, measurements of infrared absorption and photoconductivity [28], performed on UV irradiated CdF, cryst'als nominally pure or doped with Na+ or Ag+, show the existence of electronic cent'ers having energy levels peaking a t 0.34 eV under the bottom of bhe conduct'ion band. This absorption band follows t'he concentration of Na+ or Ag+ and can be bleached by heating the sample up t,o 200 K. The authors of [ZS] suggest that these centers can he at~trihut~ed t o electrons trapped a t fluorine vacancies iu a shallow stat'e.…”