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

Syage, J. A. and Lambert, Wm. R. and Felker, P. M. and Zewail, A. H. and Hochstrasser, R. M. (1982) Picosecond excitation and TRANS-CIS isomerization of stilbene in a supersonic jet: Dynamics and spectra. Chemical Physics Letters, 88 (3). pp. 266-270. ISSN 0009-2614. http://resolver.caltech.edu/CaltechAUTHORS:20160923-081446039

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Abstract

New details of the dynamics and spectroscopy of trans-stilbene are revealed by picosecond excitation of jet-cooled and collisin-free molecules. The fluorescence spectra clearly show the low-frequency torsional modes of the ground state. The time-resolved fluorescence following S_1 excitation exhibit exponential decay times ranging from 2.7 ns to ≈190 ps for excitation wavelengths varying from 3102 Å (0 excess energy) to 2850 Å (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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0009-2614(82)87085-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0009261482870851PublisherArticle
Additional Information:© 1982 Elsevier B.V. Received 5 March 1982. This material is based upon work supported by the National Science Foundation under Grant No. CHE-8112833 and CHE-7908710. Alfred P. Sloan Foundation Fellow and Camille & Henry Dreyfus Foundation Teacher-Scholar.
Funders:
Funding AgencyGrant Number
NSFCHE-8112833
NSFCHE-7908710
Alfred P. Sloan FoundationUNSPECIFIED
Camille and Henry Dreyfus FoundationUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Arthur Amos Noyes Laboratory of Chemical Physics6601
Record Number:CaltechAUTHORS:20160923-081446039
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160923-081446039
Official Citation:J.A. Syage, Wm.R. Lambert, P.M. Felker, A.H. Zewail, R.M. Hochstrasser, Picosecond excitation and TRANS-CIS isomerization of stilbene in a supersonic jet: Dynamics and spectra, Chemical Physics Letters, Volume 88, Issue 3, 7 May 1982, Pages 266-270, ISSN 0009-2614, http://dx.doi.org/10.1016/0009-2614(82)87085-1. (http://www.sciencedirect.com/science/article/pii/0009261482870851)
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ID Code:70550
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:29 Sep 2016 20:47
Last Modified:29 Sep 2016 20:47

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