Abstract
The chapter deals with elementary processes, i.e., the simple processes which proceed in one stage. The definitions of differential and total cross-sections, microscopic rate constants, and probabilities of elementary processes are introduced. The detailed balance principle, adiabatic approximations, as well as potential energy curves and surfaces, are discussed. Different types of intermolecular interactions, descriptions of collisional processes and reactions including nonadiabatic transition using potential energy curves and surfaces are examined.
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