RATE COEFFICIENTS OF THE REACTIONS OF CN AND NCO WITH O2 AND NO2 AT 296-K

Abstract

The rate coefficients of the reactions of CN and NCO radicals with O2 and NO2 at 296 K: (1) CN + O2 --> products; (2) CN + NO2 --> products; (3) NCO + O2 --> products and (4) NCO + NO2 --> products have been measured with the laser photolysis-laser induced fluorescence technique. We obtained k1 = (2.1 +/- 0.3) x 10(-11) and k2 = (7.2 +/- 1.0) x 10(-11) cm3 molecule-1 s-1 which agree well with published results. As no reaction was observed between NCO and O2 at 297 K, an upper limit of k3 < 4 x 10(-17) cm3 molecule-1 s-1 was estimated. The reaction of NCO with NO2 has not been investigated previously. We measured k4 = (2.2 +/- 0.3) x 10(-11) cm3 molecule-1 s-1 at 296 K.