ENERGY RELAXATION DURING THERMALLY ACTIVATED DIFFUSION ALONG ONE-DIMENSIONAL CHAINS WITH SITE DISORDER

The energy relaxation during thermally activated diffusion along one-d imensional chains with equally spaced traps of random energy depths ha s been studied both analytically and by computer simulations. Several time intervals, where the mean particle energy exhibits distinct tempo ral and temperature behaviors, have been identified. The explicit form s of these dependencies within each of the intervals are specified. Th e results show that the relaxation of the mean particle energy and the time evolution of the average barrier height, probed by diffusing par ticles, follow a logarithmic law rather than the Kohlrausch-Williams-W att phenomenology. (C) 1998 Elsevier Science B.V. All rights reserved.