✦ LIBER ✦

Spectroscopy and dynamics of jet-cooled 4-dimethylamino-4′-cyanostilbene in the S1 state

✍ Scribed by Rainer Daum; Tony Hansson; Ralf Nörenberg; Dirk Schwarzer; Jörg Schroeder

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 584 KB
Volume: 246
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)01165-1

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✦ Synopsis

The S I state of jet-cooled 4-(N,N-dimethylamino)-4'-cyanostilbene (DCS) was studied by picosecond fluorescence spectroscopy. The line structure of the S O -* Sl-excitation spectrum is a superposition of transitions characteristic of isolated trans-sti~bene and the dimethylamino group. Rotational contour analysis and rotational coherence spectroscopy suggest a non-planar geometry of DCS in both electronic states. Fluorescence decays are monoexponential up to 3700 cm-I above the origin at 27038 cm-~. The lifetimes vary little up to 733 cm-~ ((¢) = 2.097 ns) and start to decrease above this energy because of the onset of photoisomerization. An RRKM-fit to the non-radiative rate coefficients yields a barrier height g o = 745 cm-I.

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