The product formation of the reaction of CH radicals with NO was studied in
the gas phase at 100 Torr total pressure and 298 K. CH radicals were gener
ated by excimer laser photolysis of CHClBr2/Ar mixtures. In the presence of
nitric oxide, the formation of NH, CN and NCO radicals in their electronic
ground states was monitored by laser-induced fluorescence. From the result
s of time resolved measurements of the radical concentrations, bimolecular
rate coefficients for the reactions CH + X and X + NO [X = NH(X (3)Sigma(-)
), CN(X (2)Sigma(+)) and NCO(X 2 Pi)] were determined. From their kinetic b
ehaviour, NH and CN radicals were unequivocally identified as direct reacti
on products of the reaction CH + NO, whereas the formation mechanism of NCO
remains unclear.