Kinetics of the Reactions of NH2 Radicals with O3 and O2

Article abstract of DOI:10.1021/j150647a034

NH2 radicals were generated by the photolysis of O2 in the presence of NH3 and their subsequent kinetics were directly monitored by laser resonance absorption spectroscopy.Under our experimental conditions, NH2 + O3 and NH2 + NH2 were competitive reactions.The rate constant for NH2 + O3 was found to be (1.57 +/- 0.51)E-11 exp(-(1151 +/- 123)/T) cm³ molecule^-1 s^-1 in the temperature range 272-348 K while the rate constant for NH2 + NH2 was found to be (1.29 +/- 0.30)E-11 cm³ molecule^-1 s^-1 at 298 K and essentially independent of temperature at a pressure of ca. 200 torr.O2 was added to the system in an attempt to observe a postulated third-order reaction leading to the formation of NH2OO.An upper limit of 1.5E-36 cm⁶ molecule^-2 s^-1 was set for this process indicating that bonding between NH2 and O2 is negligible.