Spin dephasing in the photoexcited ³B₁ state of the F₂²⁺ center in CaO is investigated using techniques for optical detection of microwave-induced coherent transients. Measurements of the spin-echo decay were performed at different (low) temperatures and (low) magnetic field strengths. The spectral diffusion results give quantitative support for a model in which the dephasing is due to random modulation of the dipolar coupling between the excited $S=1$ spins and F⁺-center spins of S=1/2. A projection operator formalism is used to treat the dipolar-induced dephasing. The theory also allows for the experimental determination of the F⁺-center spin-dephasing rate. It appears that between 1 and 10 K the phenomenon of one-phonon assisted exchange narrowing occurs in the F⁺-center spin ensemble.
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Glasbeek et al. (1981) studied this question.
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