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Large isotope effect in the quenching of I(52P12) by benzene and benzene-d6

✍ Scribed by R.J. Donovan; H.M. Gillespie

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 414 KB
Volume: 56
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(78)80218-8

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✦ Synopsis

Spin-orbit relaxation of I(S2Pl/z)(aE = 0.94 eV) by benzene and benzende, has been studted at 297 K, using timeresolved atomic resonancefLuorescence. A large isotope effect is observed, IcC~H~ = (4.6 + 0.7) X lo-l3 cm3 molecule-' s-t, and ~C,D, = (9.9 c 1.0) X lo-l5 cm3 molecule-' s-l, despite evidence that formation of a bound collision complex may contribute to the quenching mechanism. The roles of resonant energy transfer channels, Franck-Condon factors and the density of fmal states, in the quenching process, are discussed.

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