Kinetics of the reaction of HO2 with NO2

Abstract

The reaction of HO2 with NO2 has been studied using laser magnetic resonance detection of HO2 with a discharge-flow system. The proposed reaction mechanism is HO2 +NO2+M →ka HOONO2 + M, and HO2 + NO2 →ka HONO+O2. Measurements were made at 300 K over the pressure range 0.5-3 torr. HO2 concentrations down to 10 10 molecules/cm3 were used to eliminate side reactions. The data were analyzed on the basis of the above mechanism and the results are kla(M)=(M = He)10.0±2.5, (M = N2)20.9±5.2,(M = O2) 15.1±3.8, and (M = NO2)66±30 in the units 10-32 cm6/molecule2s and k lb< 3×10-15 cm3/molecules. These results indicate that HOONO2 is the major product of Reaction (1). This conclusion is in agreement with other recent measurements. Copyright © 1977 American Institute of Physics.