Abstract
Previous experimental ITC data dealing with the relaxation of impurity- vacancy dipoles in europium-doped alkali halides are analyzed in terms of the reaction-rate theory of nonradiative transitions in polar solids. The temperature dependence of the dipolar relaxation time is obtained in this investigation by portional integration of the ITC bands without appealling to any classical reorientational process. It was found that according to the reaction rate theory the dipoles rotate classically and nonadiabatically with very low electron-transfer probabilities. In most of the hosts. However in KCl the dipoles reorientate via nearly equal-weight classical jumps and subbarrier tunneling with a high electron-transfer expectancy within the temperature range of the ITC band.
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