ENHANCED DIFFUSION OF IMPURITIES AND DEFECTS IN CRYSTALS IN CONDITIONS OF ULTRASONIC AND RADIATIVE EXCITATION OF THE CRYSTAL-LATTICE

On the basis of the quantum theory of diffusion the influence of cryst al lattice excitations (ultrasonic, nuclear irradiation) on the diffus ion of impurity atoms is analysed. The effects considered in the paper are determined by two factors: the change of population of the impuri ty oscillator levels due to interaction with nonequilibrium excitation s of the crystal lattice, and the change of the probability of diffusi on transitions on the given level. The effects are qualitatively diffe rent for heavy impurity atoms whose diffusion is enhanced in nonequili brium conditions and for light impurity atoms for which the effect of additional localization is possible.