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Rotational Band Contour Studies of Single Vibronic Levels in Jet-Cooled trans-Stilbene

Keelan, Brian W. and Zewail, Ahmed H. (1985) Rotational Band Contour Studies of Single Vibronic Levels in Jet-Cooled trans-Stilbene. Journal of Physical Chemistry, 89 (23). pp. 4939-4945. ISSN 0022-3654. doi:10.1021/j100269a011.

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The rotational band contours of approximately 40 vibrational levels in the first excited singlet state (S_1) of supersonic jet-cooled stilbene are obtained and analyzed by use of computer simulations. No substantial differences are found in contour shapes of different levels, which is attributed to low symmetry and/or extensive torsional motion. Approximately 35 levels are studied by frequency resolving their emission, but no dependence of contour shape on detection conditions (specific mode detected, relaxed vs. unrelaxed emission) is observed. The use of selective detection to resolve overlapping levels in excited states is discussed qualitatively and quantitatively, with excellent agreement between experiment and theory. Finally, high-resolution (0.05 cm^(-1)) maps of the two known regions in S_1 exhibiting evidence of dissipative intramolecular vibrational redistribution (IVR) are presented to clarify the level structure involved.

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Additional Information:© 1985 American Chemical Society. Received: June 5, 1985. We thank Dr. Peter M. Felker for helpful discussions and calculation of the rotational constants and Larry W. Peng for experimental assistance. This work was supported by the National Science Foundation Grant CHE-8211356.
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Arthur Amos Noyes Laboratory of Chemical Physics7202
Issue or Number:23
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Official Citation:Rotational band contour studies of single vibronic levels in jet cooled stilbene Brian W. Keelan and Ahmed H. Zewail The Journal of Physical Chemistry 1985 89 (23), 4939-4945 DOI: 10.1021/j100269a011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70470
Deposited By: Ruth Sustaita
Deposited On:29 Sep 2016 20:55
Last Modified:11 Nov 2021 04:29

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