TRANS-STILBENE AND ITS ARGON VAN DER WAALS COMPLEXES: ROTATIONALLY RESOLVED FLUORESCENCE EXCITATION SPECTRA OF THE ONE-PHOTON $S_{1} - S_{0}$ OPTICAL $TRANSITION.^{1}$
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Date
1990
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Publisher
Ohio State University
Abstract
We have obtained numerous rotationally resolved trans-stilbene fluorescence excitation spectra in a range of excess energies from - 0 to - $1200 cm^{-1}$ above the $S_{1}$ origin using the high resolution spectrometer operating in the ultraviolet. An analysis of the $0_{0}^{0}$ band has recently been $reported.^{2}$ Higher energy bands exhibit diffuse structure long before the experimentally observed rapid decrease in fluorescence $lifetime^{3}$ thought to be associated with light-induced trans-cis isomerization. We report some results and ongoing progress in our rotational spectroscopic analysis yielding molecular geometry information which is clearly relevant to understanding trans-stilbene and its dynamic behavior following the absorption of light. We also report recent elucidation of the structure of argon-stilbene complexes and some possible strategies for obtaining 'dynamical' Information directly from studies in the frequency domain.
Description
$^{1}$ Work supported by NSF. $^{2}$ B. B. Champagne, J. F. Pfanstiel, D. F. Plusquellic, D. W. Pratt, W. M. van Herpen and W. L. Meerts, J. Phys. Chem. 94, 6 (1990). $^{3}$ J. A. Syage, P. M. Felker, and A. H. Zewail, J. Chem. Phys. 81, 4706 (1984).
Author Institution: Department of Chemistry, University of Pittsburgh
Author Institution: Department of Chemistry, University of Pittsburgh