DIFFUSION IN A NONORDERED LINEAR-SYSTEM

Computer modeling of the thermally activated diffusion of particles al ong a segment containing 500, 1000, or 2000 points is undertaken. The ground-state and transitional-state energies are described by two-leve l distributions. Two-level distribution of the diffusional jump length s is also considered. In all cases, the ordinary diffusional law is ob served at large diffusion times: the mean square displacement of the p articles is proportional to the number of jumps and the diffusion time , Increasing the width of the energy distribution for the transitional states reduces the correlation factor. If all the ground-state energi es are the same, the theoretical steady diffusion coefficient is equal to the nonsteady diffusion coefficient. Increasing the width of the g round-state energy distribution reduces the nonsteady diffusion coeffi cient,,without affecting the steady coefficient.