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Picosecond excitation and TRANS-CIS isomerization of stilbene in a supersonic jet: Dynamics and spectra

✍ Scribed by J.A. Syage; Wm.R. Lambert; P.M. Felker; A.H. Zewail; R.M. Hochstrasser

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
346 KB
Volume
88
Category
Article
ISSN
0009-2614

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✦ Synopsis

New details of the dynamics and spectroscopy of trans-stilbene are revealed by picosecond excitation of jet-cooled and collision-free molecules. The fluorescence spectra clearly show the low-frequency torsional modes of the ground state. The time-resolved fluorescence following $1 excitation exhibit exponential decay times ranging from 2.7 ns to ~-190 ps for excitation wavelengths varying from 3102 A (0 excess energy) to 2850 A (2851 cm -1 excess energy). The results indicate that an energy threshold for isomerization occurs at ~ 1200 cm -1 . The redistribution of vibrational energy from the optically excited modes to the ethylene bond torsional modes leading to isomerization is discussed.

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