FLUORESCENCE EXCITATION SPECTROSCOPY OF p-C6H4Cl2 AND p-C5D4Cl2 IN A SUPERSONIC FREE JET EXPANSION

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1988

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Ohio State University

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The spectra of $p-C_{6}H_{4}Cl_{2}$ and $p-C_{6}H_{4}Cl_{2}$ have been assigned over the range of $D - 2500 cm^{-1}$. The spectra are dominated by totally symmetric vibrations and vibronically allowed $b_{3g}$ vibrations. Overtones of several out of plane bending modes are observed. The S1 frequencies are markedly reduced from $S_{0}$ values, indicating that the molecules are significantly less rigid in $S_{1}$. Isotopic frequency shift ratios due to chlorine and deuterium/hydrogen substitution are in good agreement with those derived from ab initio calculations of vibrational frequencies and normal modes.

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Author Institution: Department of Chemistry, Virginia Commonwealth University

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