Abstract
The static and dynamic properties of the phosphorescent triplet state of the F center in CaO in the presence of a [101] stress have been investigated by optically detected magnetic resonance. From optical polarizations and results of transient-nutation experiments it is concluded that both the E g and the T 2g strain components induced by the stress determine the structure of the 3T 1u state. By means of time-resolved ODMR experiments it is demonstrated that the spin—lattice relaxation and spin dephasing proceed by Orbach-type relaxation processes between the stress-split vibronic states, induced by time-dependent E g and T 2g strains resulting from lattice vibrations. The influence of the temperature and the excitation intensity on the relaxation rates shows that at 1.2 K the dynamics in this system is governed by phonons that are generated in the optical-excitation cycle.
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