화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.106, No.36, 8249-8255, 2002
Product studies of inelastic and reactive collisions of NH2+NO: Effects of vibrationally and electronically excited NH2
The reaction between NH2 and NO has been studied by time-resolved step-scan Fourier transform infrared emission spectroscopy. We observe time-dependent emission from vibrationally excited NO, N2O, and H2O arising from the interaction of NO with both relaxed and initially vibrationally and electronically excited NH2, produced by the 193 nm laser photolysis of ammonia. The excited NH2 gives rise to a rapidly decaying emission signal. The correlated time dependences of the vibrationally excited NO and N2O signals suggest that they are formed by direct collisions of NO with the vibrationally excited NH2. There is sufficient excitation of the NH2 to overcome the high barrier to N2O formation. The emission from vibrationally excited H2O shows that its formation is delayed, with a significant induction period. The time dependence of the H2O induction period matches well to the decay of emissions from the nu(1) and nu(3) bands of NH2, suggesting that the NH2 is deactivated to its ground electronic and vibrational states before the water product is produced by reaction with NO.