LASER INDUCED FLUORESCENCE SPECTRA FROM PHOTOFRAGMENTS OF TOLUENE: A NEW ELECTRONIC TRANSITION OF $C_{2}$

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1987

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Ohio State University

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The high fluence 193 nm photodissociaton of toluene has been investigated in a free jet expansion. Laser induced fluorescence spectra of the products show a large number of resolved ro-vibronic bands in the range of 21,000 to $24,500 cm^{-1}$. Many of these have been assigned to $C_{2}$ and $C_{3}$. The $C_{2}$ is produced in metastable electronically excited states, and a new band system originating from the $C^{3}\Sigma_{u}{^{+}}$ state has been observed. Two bands of this system, with origins at 22,347.0 and $22,462.5 cm^{-1}$, show the simple P and R branch structure of a $\Sigma - \Sigma$ transition. A preliminary rotational analysis yields an upper state rotational constant (for the band at $22,347 cm^{-1}$) of $1.91 cm^{-1}$, which is significantly larger than the constants for any of the previously characterized excited states. The details of these experiments, and the results from a more extensive analysis of the spectra, will be presented.

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Author Institution: Department of Chemistry, Northwestern University; Department of Chemistry, Emory University

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