Kinetics of resonance stabilized CH3CCCH2 radical reactions with NO and NO2

The gas phase kinetics of CH3CCCH2 radical reactions with NO and NO2 have been studied in direct time-resolved measurements using temperature controlled flow tube reactors coupled to a laser photolysis/photoionization mass spectrometer. Rate coefficients of both reactions were observed to display negative temperature dependence which for the NO2 reaction can be represented with k (CH3CCCH2 + NO2) = (3.97 ± 0.10) × 10−11 × (T/300 K)−1.43 ± 0.12 cm3 s−1 (221−363 K). The bath gas pressure dependence observed in the NO reaction required a pressure falloff parameterization to express the obtained rate coefficients (273−363 K). The association product C4H5NO was directly observed in the NO reaction and a product with a formula C4H5O was recorded in the NO2 reaction.