Abstract
Up until this point, we have been concerned almost exclusively with singlet thermal and photochemical reactions. We now turn our attention to triplet reactions which are different from the corresponding singlet reactions in the following two respects: a) The diabatic surface energetic interrelationships are different, e.g., the energies of the 1DA* and 3DA* diabatic surfaces are different. This can become responsible for different photochemical barrier heights in singlet and triplet reactions. b) In the case of a triplet reaction, a spin inversion process is required for decay to ground state reactants or products. Such a process is not demanded in a singlet reaction. We shall now consider the two key differences in some detail. KeywordsSpin OrbitRotational MechanismCoupling Matrix ElementInteraction Matrix ElementDistortion ModeThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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