microscopic diffusion control (encounter control)

https://doi.org/10.1351/goldbook.M03912
The observable consequence of the limitation that the rate of a @[email protected] @[email protected] in a homogeneous medium cannot exceed the rate of @[email protected] of the reacting @[email protected] If (hypothetically) a @[email protected] reaction in a homogeneous medium occurred instantaneously when two reactant molecular entities made an @[email protected], the @[email protected] would be an @[email protected], determined solely by rates of @[email protected] of reactants. Such a hypothetical 'fully @[email protected] controlled rate' is also said to correspond to 'total microscopic @[email protected]', and represents the asymptotic limit of the @[email protected] as the @[email protected] for the chemical conversion of the @[email protected] into product (or products) becomes large relative to the @[email protected] for separation (or @[email protected]) of the @[email protected] 'Partial microscopic @[email protected]' is said to operate in a homogeneous reaction when the rates of chemical conversion and of separation are comparable. (The degree of microscopic @[email protected] cannot usually be determined with any @[email protected])