Rate constants for the radical-radical reaction between CN and O 2 at temperatures down to 99 k

Abstract

Pulsed laser photolysis-laser-induced fluorescence (LIF) measurements have been made to determine the kinetics of the reaction of CN(ν = 0) with O 2 in the temperature range 297 to 99 K. The rate constants rise monotonically as the temperature is lowered and, together with the results from earlier experiments at temperatures from 295 to 761 K, can be fitted to the expression k = (2.49 ± 0.02) ( T/298) −0.50±0.015×10 −11 cm 3 molecule −1 s −1. The reaction is clearly a prototypical radical-radical reaction with its rate controlled by the attractive potential between the reagents.