Abstract
Infrared kinetic spectroscopy using excimer laser flash photolysis and color center laser probing has been used to study the NH/sub 2/ + NO reaction. The amidogen radical, NH/sub 2/, was produced by ArF photolysis of NH/sub 3/. Infrared absorptions of OH and H/sub 2/O were measured to determine the absolute contributions of the OH and H/sub 2/O product channels. It was found that the OH channel accounts for 13 +- 2% of the reaction. Using two different pairs of NH/sub 3/ and H/sub 2/O lines, we measured values of 0.85 +- 0.09 and 0.66 +- 0.03 for the ratio of H/sub 2/O formed to NH/sub 3/ photolyzed. All of the H/sub 2/O signals exhibit a pronounced induction period suggesting that H/sub 2/O is produced in very high vibrational states. The time evolution of low-lying vibrationally excited and ground vibrational state H/sub 2/O lines is adequately simulated by a model in which a stepwise sequential loss of vibrational energy occurs with quenching cross sections for each step proportional to excess energy.
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