THE LOWEST TRIPLET STATE OF PERDEUTEROBENZENE
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Date
1968
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Ohio State University
Abstract
Absorption spectra of the lowest triplet state $(^{3}B_{1u})$ of perdeuterobenzene have been obtained by monitoring the phosphorescence from perprotonated henzene traps in a mixed crystal of 1% $C_{5}H_{6}$ in $C_{6}D_{6}$ at $4^{\circ}K$ as a function of exciting wavelenght. By far the most prominent feature of these spectra is an intense doublet with maxima at 218 and $230 cm^{-1}$ to the high energy side of the 0-0. On the basis of a purely hexagonal static configuration for this triplet state, one would expect the most prominent vibronic lines to involve $e_{2g}$ vibrations. However, the lowest frequency $e_{2g}$ vibration in this state is expected to have a frequency of about $500 cm^{-1}$ and consequently cannot explain the observed doublet. We thus have compared our experimental observations with a theoretical model involving a ``pseudo'' Jahn-Teller distortion of the lowest triplet state.
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Author Institution: IBM Research Laboratory