The photodissociation of iodine has been studied in the@ phase by Iaser fIash photoiysis. The decrease of the quantum yield with increasing ethane and propane pressure has been intirpreted in terms of the cage effect. As the tempemture is increased a less pronounced czge effect is observed\_ The tre
Temperature dependence of cage processes in the photofragmentation of phenyl acetate
โ Scribed by E. Ghibaudi; A.J. Colussi
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 361 KB
- Volume
- 94
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
It \.I% found that the ratio of initial yields of o-h> dro\yacetophenonc and phenol in the photodocompodtion ofphcnyl acetafe in be\an:: is a linear function of nT "' bet\een 724 .md 330 K_ The observed temperature dependence is awribcd lo the competition between combination and daproportiorution of acetyl -and phenoky mdicals r~tber tb~n to gcminatc combinatwx And esclipr from the sobent use.
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It is shown that the fluorescence quantum yield depends on temperature rather than on the viscosity of the solvent. The intersystem crossing rate can IX described ;1s a sum of a temperature independent and a temperature dependent term. I;or most of the molecules investigated in this paper the latter
The intrinsic fluorescence yield and lifetime for the benzene exciiner are presented as functions of temperature. 'The excimer radiative decay process is found to be temperature dependenr, with an activation en&y of 0.145 eV and an associated pre-exponential factor of 2.4 X 1Oa set-' .