Atomisation kinetics when molecular adsorption is activated

4 Atomisation kinetics when molecular adsorption is activated 

So that we will be able to consider the controversy concerning the atomisation of hydrogen by gold [111], we now develop relations for the kinetics of atomisation when s2 is not constant, but depends on temperature. The discussion will also be relevant to our later development of the kinetics of recombination. We assume that the adsorption of a molecule requires the presence of two adjacent vacant surface sites and that the probability that adsorption occurs when a molecule strikes such a pair of sites is k2,1 so we write 

we suppose that activated processes at the surface are controlled by the temperature of the surface, so that 

Solution of this equation for d enables the calculation of the probability of atomisation by means of eqn. (39) written in the form 

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