LASER INDUCED FLUORESCENCE SPECTRUM OF JET COOLED SYM-TRIAZINE VAPOR

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1981

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Ohio State University

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The electronic transition between the ground $\tilde{X}$ and the $\tilde{A}E’‘$ ``state of sym-triazine, $C_{6}N_{3}H_{3}$, has been the subject of much previous study. However, the transition is only imperfectly understood because of the complexity and congestion of available experimental spectra and the theoretical problems caused by the combination of a Jahn-Teller and pseudo Jahn-Teller effect in the excited $\tilde{A}$ state. We have obtained laser induced fluorescence excitation spectra of gaseous triazine cooled to $\sim1^{0} K$ in a supersonic free jet expansion. The elimination of vibrational hot bands and extended rotational structure allows the observation of a discrete, ``sharp line’’ vibronic excitation spectrum. By narrowing our laser bandwidth, we can obtain complete rotational resolution and analysis of selected vibronic transitions. Radiative lifetimes and collision cross sections have also been measured on selected transitions.

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