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Test for photochemical scrambling in the non-radiative relaxation of the excited Ã 1B2u state S1 of benzene

✍ Scribed by J.H. Callomon; L.W. Somers

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 565 KB
Volume: 144
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(88)87297-x

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✦ Synopsis

The possible role of valence isomers as intermediates in the unimolecular non-radiative relaxation ("internal conversion") of the S, state of benzene, including the fast channel 3 process, has been tested by irradiating the 260 nm absorption-system of 1,3,5trideuterobenzene and looking for isotopically scrambled products, particularly 1,2,4-trideuterobenzene. No evidence was found either for any scrambling or for the formation of any stable non-benzenoid valence isomers. The quantum yield for any scrambling process via channel 3 under collisionless conditions must be less than 0.005. Products of photodissociative or bimolecular processes, including wall effects, were also unimportant: recovery of unchanged benzene was up to 90%.

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