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We present arguments for the utility of a Brownian motion model of the interaction between reacting chemicals on surfaces and the substrate electrons. The basic equation of such a model, the Fokker-Planck equation for the description of the chemicals' kinetics, is derived in the limit of their mass becoming infinite. Since we envisage the practical application of this equation, a discussion is given of the physical significance of the corrections due to the finite mass of the chemicals. Several general assumptions of the derivation, valid in the infinite mass limit, lead to apparent temperature restrictions for finite mass. The necessity of these restrictions is examined and argued to be not of critical importance.
W. L. Schaich (Fri,) studied this question.