Collision frequency

Main article: Collision theory

Collision frequency is defined in chemical kinetics, in the background of theoretical kinetics, as the average number of collisions between reacting molecules per unit of time per moles of reactant. Its symbol is Z. For a gas-phase bimolecular reaction, Z is

$Z=N_{A}\sigma _{AB}{\sqrt {\frac {8k_{B}T}{\pi \mu _{AB}}}}$

N_A is Avogadro's number
σ_AB is the reaction cross section
k_B is Boltzmann constant
T is temperature in kelvin
μ_AB is the reduced mass of the reactants

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