Optical excitation of additively coloured CaO crystals generates 'T1u and 3T1u excited states and F+ defects, the latter being revealed by EPR experiments. Interaction of the excited 3T1u triplet state and the F+ centre is documented by the emissive character of the transient EPR signal detected just after a laser pulse. A quenching of the initial polarization, observed at high microwave power, is ascribed to microwave saturation of the F+ spin levels.
Time resolved EPR study of spin polarization and dynamics of F+ centres in additively coloured CaO crystals
CORVAJA, CARLO;FRANCO, LORENZO;TOFFOLETTI, ANTONIO
1994
Abstract
Optical excitation of additively coloured CaO crystals generates 'T1u and 3T1u excited states and F+ defects, the latter being revealed by EPR experiments. Interaction of the excited 3T1u triplet state and the F+ centre is documented by the emissive character of the transient EPR signal detected just after a laser pulse. A quenching of the initial polarization, observed at high microwave power, is ascribed to microwave saturation of the F+ spin levels.
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