M center reorientation in CaF2
- 1 May 1973
- journal article
- research article
- Published by Wiley in Physica Status Solidi (b)
- Vol. 57 (1) , 63-68
- https://doi.org/10.1002/pssb.2220570105
Abstract
The reorientation efficiency of M centers in CaF2 is found to be directly proportional to the M+ center concentration. The wavelength dependence of the efficiency for optically induced reorientation is also found to agree with the M absorption rather than the MF. We propose that the M centers in CaF2 reorient under ultraviolet excitation by first photoionizing, i.e., becoming an M+ center; this M+ center then absorbs light in the same spectral range and reorients during a nonradiative transition from the excited state. This agrees with the mechanism found previously in the alkali halides.Keywords
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