Abstract
On the basis of a four-electronic-state model, the rate constant for intersystem crossing in aromatic compounds is formulated by means of a Green function technique. The rate constant is expressed as the sum of the four terms representing direct, indirect, mixed and interference decay processes. The anomalous rate constants for the intersystem crossings in benzophenone and 9,10-diazaphenanthrene, which do not obey the El-Sayed rule, can be explained in terms of indirect and mixed decay processes.
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