Temperature Dependence of Singlet—Triplet Intersystem Crossing in Anthracene Crystals
- 1 June 1967
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 46 (11), 4248-4251
- https://doi.org/10.1063/1.1840532
Abstract
The formation of triplet excitons from singlet excitons via a radiationless transition (intersystem crossing) is studied in anthracene crystals. Using blue exciting light with 430 mμ>λ>350 mμ the temperature dependence of the intersystem crossing is found to follow an exponential law with an activation energy of 800±50 cm−1. It is concluded that this transition starts from a vibrationally excited single state and involves the second triplet state. The total energy of this vibrational state is about 26 100 cm−1 in good agreement with that suggested by Kellogg, 26 050 cm−1, for an excited triplet level. No emission from the triplet—triplet transition could be observed.Keywords
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