The Elovich equation dg/di = ae~at where g is the amount chemisorbed at time t, and a and a are constants, is shown to be applicable to a large body of rate of chemisorption data. The significance of a and a is examined and shown to imply that the prime function of the gas, initially, is the production of surface sites which, over the course of the slow adsorption, decay at a bimolecular rate. The rate of slow chemisorption is governed solely by the availability of sites. Parallels to the proposed schemes are found in kinetics of luminescence and photoconductivity of solids.
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