Abstract
The excited-state configuration of ${F}_{A}$(II) has been modeled by a potential that is stable (harmonic) for all displacements except one (${Q}_{\mathrm{vac}}$) in which neighbor-correlated passage of the vacancy occurs between equivalent 100-type positions. Solving classical equations of motion for atomic displacements we derive the time of residence in the initially excited-state configuration, as well as decay and correlation times for the dephasing of ${Q}_{\mathrm{vac}}$. The times range between a few and some ten Debye periods and decrease with increasing temperature. Results are comparable with relaxation times measured by Wiesenfeld, Mollenauer, and Ippen in KCl:Li. Their quantum-mechanical calculations are justified in terms of our model.
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