Terms and Definitions

Activation energy The minimum kinetic energy possessed by the reactants in a bimolecular reaction in order for a collision to result in a reaction. See Equation (2.10) and accompanying discussion. adiabatic A thermodynamic process occurring at constant entropy and thus without gain or loss of heat. In the atmosphere such a process conserves potential temperature and potential vorticity. association reaction A reaction that involves the association of two atoms or molecules to form a single...

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Figure 2.1 Daytime average photolysis frequencies versus pressure for selected species. The rates are for typical mid-latitude conditions. The O, photolysis rate is the sum of the rates of the O('P) and O('D) product channels. The rates are calculated by the photolysis routine from the Goddard three-dimensional Chemical Transport Model 28 . A second-order reaction is one with two reactants, such as the reaction between chlorine monoxide (CIO) and atomic oxygen (O) and whose rate is the product...