Abstract
A kinetic theory is presented to describe the occurrence of long jumps of adsorbed molecules in a one-dimensional periodic potential. Under the assumption of collisional energy exchange with substrate excitations to be strong enough (≳kT), the jump length distribution is given by a simple analytic function of one parameter, the ratio of two characteristic times: the time of flight through a potential cell and the molecule–substrate relaxation time. It is strongly dependent on this ratio. The theory offers the possibility to understand the results of recent experiments.
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