A theory for treatment of reaction kinetics in confined spaces is developed using Transition State Theory as a guide. The technique employs modifying the partition functions for the reactant and transition state based on the geometric restrictions posed by the confining medium. The result of the calculation is a term which corresponds to an effective excluded volume for the reactants and transition state. Models for calculation of the restriction factor are proposed within two limiting cases which correspond to a "spherical" molecule and a "linear" molecule, where it is assumed that the potential can be treated as separable. The two limiting cases are related to possible reaction mechanisms.
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