Abstract
The magnetic circular dichroism (MCD) of the absorption band in KF has been detected. The field and temperature dependence of the MCD signal yielded and meV for the orbital factor and spin-orbit splitting of the excited state of the center. The effect of unpolarized optical pumping on the MCD signal was investigated, with the result that at the maximum power level used (∼ photons/sec) approximately 75% of the signal was quenched. The data have have been interpreted using a simple model involving a small (efficiency ) spin-memory loss while the -center electron is in the excited state. The fact that the spin polarization of the center can be completely quenched if the pumping intensity is high enough is sufficient to explain the absence of a spin-dependent contribution to the magnetic circular polarization of the -center emission observed by Fontana and Fitchen.
- Received 27 January 1970
DOI:https://doi.org/10.1103/PhysRevB.2.1107
©1970 American Physical Society