Rate Expression Incorporating Interaction between Reactants: Application to the Zero-Order Desorption Spectra

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Abstract
A new and simple rate expression incorporating mutual interaction between reactants is presented within the framework of absolute-reaction-rate theory. The expression is derived by applying a simplified model of the lattice-gas Hamiltonian and working with it in the molecular-field approximation. Applications to the results of zero-order desorption spectra occurring in isothermal- and thermal-desorption measurements are discussed. Direct extension of the present results to the general inhomogeneous reactions suggests that the reaction rate would be zero order whenever an adsorptive reactant system is in the two-phase or multiphase coexistence region.