Which experimental results are of prime concern

In Sect. 2, a few experimental results were mentioned which strongly indicate that some molecular reactions are limited by the rate of approach of reactants to form an encounter pair. There have been many hundreds of studies of the rates of reaction in solution. Some studies are discussed in books and reviews by Grunwald et al. [19], Pilling [35], Sutin [15], Rice and Pilling [39], Hart and Anbar [17], Birks [6] and Lorand [22]. As it is not the purpose of this article to consider all these studies but to select some of the more recent, detailed and interesting studies to compare theory and experiment, the reader is encouraged to consult these articles as well as this review. 

The remainder of this section considers several experimental studies of reactions to which the Smoluchowski theory of diffusion-controlled chemical reaction rates may be applied. These are fluorescence quenching of aromatic molecules by the heavy atom effect or electron transfer, reactions of the solvated electron with oxidants (where no longe-range transfer is implicated), the recombination of photolytically generated radicals and the reaction of carbon monoxide with microperoxidase. 

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