RATES OF THE REACTIONS CN+H2CO AND NCO+H2CO IN THE TEMPERATURE-RANGE 294-769 K

Abstract

The rate coefficients of the reactions: (1) CN + H2CO --> products, and (2) NCO + H2CO --> products in the temperature range 294-769 K have been determined by means of the laser photolysis-laser induced fluorescence technique. Our measurements show that reaction (1) is rapid: k(1)(294 K) = (1.64 +/- 0.25) x 10(-11) cm(3) molecule(-1) s(-1); the Arrhenius relation was determined as k(1) = (6.7 +/- 1.0) x 10(-11) exp[(-412 +/- 20)/T] cm(3) molecule(-1) s(-1). Reaction (2) is approximately a tenth as rapid as reaction (1) and the temperature dependence of k, does not conform to the Arrhenius form: k(2) = 4.62 x 10(-17)T(1.71) exp(198/T) cm(3) molecule(-1) s(-1). Our values are in reasonable agreement with the only reported measurement of k(1); the rate coefficients for reaction (2) have not been previously reported.