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Picosecond analysis of trans-stilbene fluorescence

✍ Scribed by F. Heisel; J.A. Miehe; B. Sipp

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
390 KB
Volume
61
Category
Article
ISSN
0009-2614

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✦ Synopsis

The appearance of two components in the decay of the emission of trans-stilbene solutions has been re-elamined b> an analysis of the time resolved fluorescence in the pica-and nanosecond r&on. above 273 K_ The slow component, attributed to a return to the trans-o,eometry after initial photoisomerization. has not been observed in pure samples. Frsm the measured lifetimes It results that the rate constant k rP for photoisomerization to ewited twisted stdbene sho\s an Arrhenius temperature dependence. v.ith an activation energy of 2-6 kul/mole and a frequency factor of 1.2 X 10" s-'. The rerene process has a rate constant kpt with ktp/kpt %-5 X 102.

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