Rotational selection rules for nonradiative processes

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Abstract
Recent experiments indicate that nonradiative transitions not only differ for various single vibronic levels but are also strongly dependent on the rotational states involved. Thus the rotational selection rules should be considered for these rotational transitions. Rotational matrix elements and selection rules are presented for internal conversion between two triplet or two singlet states and for intersystem crossing between a singlet and a triplet for polyatomic molecules in Hund’s case b. The selection rules are, in general, different for each process and depend on the nature of the angular momentum coupling as well as the interaction operator.