VIBRONIC COUPLING THROUGH METHYL TORSIONS IN HEXAMETHYLBENZENE
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Date
1974
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
It has been shown recently that crystal vibrations can be conveniently classified as internal, semi-$internal^{1}$ (or semi-external), or external. While the nature of the vibronic coupling with internal and external $vibrations^{2}$ has been explored extensively, the coupling with semi-internal vibrations has not received attention. We present such an investigation on hexamethy1benzene in which its coupling of the electronic states with the methyl torsional vibration has been studied. Results will be presented from fluorescence, absorption and phosphorescence studies of isotopic and chemically mixed hexamethy1benzene condensed phases at very low temperature, as well as from Raman $spectra^{3}$ of neat and isotopic mixed crystals. The vibronic coupling through methyl torsions will be discussed with emphasis on the relative contributions from the static and dynamic interactions in the various condensed phases.
Description
$^{1}$P. N. Prasad and R. Kopelman, Chem. Phys. Letters 21, 505 (1973). $^{2}$S. D. Woodruff, P. S. Prasad, and R. Kopelman, J. Chem. Phys. (1974). $^{3}$P. N. Prasad S. D. Woodruff, and R. Kopelman, Chem. Phys.1, 173 (1973).
Author Institution: Department of Chemistry, The University of Michigan
Author Institution: Department of Chemistry, The University of Michigan