Abstract
Methods of pulse spectroscopy with time resolution were used to investigate creation and annihilation processes of F2 +-, F2-, F −2 -centers, which are noninertial with respect to the duration of an electron pulse of nanosecond duration acting on the crystal. It is concluded on the basis of these studies that the effect of radiation on an F2-center is a change in its charge and spin states. It is established that the direction of change of an F2 -center charged state is determined by the value of its spin: localization occurs of a band hole on an F2-center in the singlet ground state, and of an electron in the on an F2-center in the triplet state. An F2-center triplet state is formed during the electron localization process on an F2 +-center or subsequent localization of band holes and an electron on an F2-center as a result of a thermally activated intercombination transition from a higher state than the radiating singlet.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 109–120, October, 1991.
In conclusion the author is grateful to V. A. Kravchenko for participation in the experiments, and to V. M. Lisitsyn and V. Yu. Yakovlev for interesting discussions.
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Lisitsyna, L.A. Effect of spin of F3-center on changes in its charge under the action of radiation. Soviet Physics Journal 34, 937–946 (1991). https://doi.org/10.1007/BF00898596
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DOI: https://doi.org/10.1007/BF00898596