dc.creator Walker, R. A. en_US dc.creator Richard, E. C. en_US dc.creator Lu, K.- T. en_US dc.creator Weisshaar, J. C. en_US dc.date.accessioned 2006-06-15T15:25:30Z dc.date.available 2006-06-15T15:25:30Z dc.date.issued 1994 en_US dc.identifier 1994-TF-08 en_US dc.identifier.uri http://hdl.handle.net/1811/13284 dc.description 1. R.A. Walker, E.C. Richard, K-T. Lu, J.C. Weisshaar, work in progress. en_US dc.description Author Institution: Department of Chemistry, University of Wisconsin; Department of Chemistry, University of California-Berkeley; Department of Chemistry, University of Wisconsin en_US dc.description.abstract Employing techniques of resonance enhanced two photon ionization and threshhold electron field ionization, we have measured both the $S_{1} \leftarrow S_{0}$ and cation $\leftarrow S_{1}$ spectra of 2,6-difluorotoluene (DFT)$^{1}$ DFT’s $S_{1} \leftarrow S_{0}$ origin lies at $37948 cm^{-1} (\pm 0.3 cm^{-1})$, and DFT shows an adiabatic ionization potential of $73673 cm^{-1} (\pm7.0 cm^{-1})$. Slightly to higher energy of the $S_{1}$ and cation origins. We observe a number of band which we assign to internal rotation of the DFT methyl group. Fitting these features to a sixfold symmetric potential $\left(\frac{\nu_{4}}{2}(1 - \cos 6 \alpha)\right)$ suggests a very low barrier to methyl rotation in both the $S_{1}$ $(|V_{6}(S_{1})| \sim 20 \ cm^{-1})$ state and cation ground state $(|V_{6}(D_{o})| \sim 10 cm^{-1})$. These measured barriers are consistent with ab initio calculations predicting a small $V_{6}$ in the ground state of DFT $(V_{6}(S_{o})= 17.4 cm^{-1})$. This talk will focus on the origin of these small $V_{6}$ terms in the context of $V_{6}$ potentials found for other six-fold symmetric molecules. Additionally, a coupling mechanism invoked to explain several nominally forbidden transitions observed in the spectra will be discussed. en_US dc.format.extent 140792 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title LOW ENERGY INTERNAL ROTATION IN THE $S_{1}$ AND GROUND CATION STATES OF 2,6-DEFLOUROTOLUENE en_US dc.type article en_US
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