Elementary reactions compensation effect

It was realized many years ago that compensation effects can be considered to be based on either analysis of multistep complex reactions or elementary reactions. The supposition that if the compensation effect exists it cannot be attributed to an elementary process was introduced at least 40 years ago by Kiperman and was pointed once more by Bond (G.C.Bond, M A. Keane, H. Krai, J. A. Lercher, Compensation phenomena in heterogeneous ctalysis General principles and a possible explanation, Catalysis Reviews, 42 (2000) 323) that very frequently observed correlation in the literature between activation energy and pre-exponential factor arises from the use of apparent rather than true activation energies, with the most common explanation for that being either the surface heterogeneity or the occurrence of two or more concurrent reactions. 

The compensation effect is absent from gas-phase reactions of atoms and radicals with molecules, it is not either observed for radical reactions in solutions when one of two reactants is a nonpolar particle. One of the sources of this effect is the influence of the medium on the elementary act of polar particles. The rate constant of bimolecular reaction in a solution depends on the association constant of particles Kj q, amplitude of vibrations of particles a and dielectric constant e. All these... 

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