✦ LIBER ✦

Photoisomerization dynamics of alkyl-substituted stilbenes in supersonic jets

✍ Scribed by Klaus Rademann; Uzi Even; Shiomo Rozen; Joshua Jortner

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 627 KB
Volume: 125
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)85145-4

No coin nor oath required. For personal study only.

✦ Synopsis

We report time-resolved fluorescence decay lifetimes from photoselected states of jet-cooled 4-ethyl-trans-stilbene (4ETS) and 4-n-propyl-trans-stilbene (4PTS) in the energy range E, = O-2800 cm-' above the S, origin. Alkyl substitution enhances the non-radiative decay rates. These data can be fitted by the statistical RRKM theory in conjunction with the reduction of the photoisomerization threshold from E, = 13OOk 50 cm-' for trans-stilbene to Et = 1100 f 100 cm-' for 4ETS. and E, = lOOO+ 100 cm-' for IPTS.

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