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On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing

โœ Scribed by H. Kono; S.H. Lin; E.W. Schlag

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
529 KB
Volume
145
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The strong temperature dependence of T, -63, intersystem crossing (ISC) and the energy dependence of T, +S, under collisionfree conditions is semiquantitatively discussed on the basis of a model in which consideration is given to low frequency modes that undergo a large increase in frequency in going from Tr to So. It is shown that such modes play a key role in the strong temperature or energy dependence. The increase in ISC rate by methylation, which has been reported for benzene and diazabenzenes in solid matrices, is explained by the assumption that the frequencies of the vibronic coupling modes are reduced more in T, than in So because of the reduction in the T2-Tr energy gap by methylation.

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