KINETICS OF THE CN+CH2CO AND NCO+CH2CO REACTIONS

The CN + CH2CO and NCO + CH2CO reactions were studied over the tempera ture ranges 296-567 K and 296-556 K, respectively, using time-resolved infrared diode laser absorption and visible laser-induced fluorescenc e spectroscopy. The total rate constant data were fit to the following expressions: k(1)(CN + CH2CO) = (2.37 +/- 0.5) X 10(-11) exp[552.6 +/ - 97/T] and k(2)(NCO + CH2CO) = (1.71 +/- 0.27) X 10(-12) exp[713.2 +/ - 56/T] cm(3) molecule(-1) s(-1). Detection and quantification of CO p roduct yields suggests that an addition-elimination mechanism producin g CH2CN + CO or CH2NCO + CO dominates these reactions, and that hydrog en abstraction to produce HCN + HCCO or HNCO + HCCO is a minor or negl igible product channel. (C) 1998 Elsevier Science B.V. All rights rese rved.