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 4.38 Measured mid-latitude profiles of HF and COF,. COFC1 is derived from a model. (After Sen c al. 1381, Figure 9.) The chemistry of iodine and its implications for stratospheric O, loss are less well known than those of the other halogens discussed in this chapter (chlorine, bromine, and fluorine). Because the lifetime of iodocarbons, the iodine source gas, is a few days in the troposphere compared to tropospheric lifetimes of years for CFCs it has generally been assumed that these...