Abstract
Utilizing the technique of triplet absorption detection of magnetic resonance (TADMR), we have determined the rates of intersystem crossing for the individual spin levels of the anthracene- h 10 and - d 10 and 3,4-benzpyrene triplet states in Shpolskii solvents. The anthracene results are in agreement with other experimental and theoretical work on intersystem crossing in aromatic hydrocarbons. The benzpyrene results, however, are unique, showing a large contribution from the out-of-plane spin level. Possible explanations of this result are discussed.
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