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DOUBLE RESONANCE OVERTONE SPFCTROSCOPY OF HYDRAZOIC ACID
Michael R. Wedlock, Bernd Kuhn, Thomas R. Rizzo
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Abstract
We present double resonance overtone photofragment spectra of hydrazoic acid ($HN_{3}$) for several vibrational bands near the lowest energy spin-allowed product channel $(HN_{3} \\rightarrow N_{2} + NH(a^{1} \\Delta)$. Double resonance overtone photofragment spectroscopy is a three-laser technique which combines IR-visible double resonance excitation of a vibrational level above the dissociation energy with LIF detection of the photofragments. We have obtained results for the fifth overtone of the NH stretch $(6\\nu_{1})$, as well as for several close-lying combination bands. With these spectra we can establish more precise limits on the dissociation threshold for the lowest spin-allowed product channel than were previously available. In addition, comparison of the underlying structure in individual rotational lines from different vibrational bands shows dramatic variations.