Abstract
The reaction between NH 2 and NO has been studied by time-resolved step-scan Fourier transform infrared emission spectroscopy. We observe time-dependent emission from vibrationally excited NO, N 2 O, and H 2 O arising from the interaction of NO with both relaxed and initially vibrationally and electronically excited NH 2 , produced by the 193 nm laser photolysis of ammonia. The excited NH 2 gives rise to a rapidly decaying emission signal. The correlated time dependences of the vibrationally excited NO and N 2 O signals suggest that they are formed by direct collisions of NO with the vibrationally excited NH 2 . There is sufficient excitation of the NH 2 to overcome the high barrier to N 2 O formation. The emission from vibrationally excited H 2 O shows that its formation is delayed, with a significant induction period. The time dependence of the H 2 O induction period matches well to the decay of emissions from the v 1 and v 3 bands of NH 2 , suggesting that the NH 2 is deactivated to its ground electronic and vibrational states before the water product is produced by reaction with NO.
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