Diode laser study of the NCO + NO2 reaction

Article abstract of DOI:10.1021/j100153a037

Infrared diode laser absorption spectroscopy was used to investigate the kinetics and product channels of the NCO + NO₂ reaction. The total rate constant was fit to the form k = 10^-11.38±0.06 exp[(441 ± 53)/T] over the temperature range 298-500 K. The major product channel was CO₂ + N₂O, accounting for 91.7 ± 4.0% of the total observed products; CO + 2NO accounted for the remaining 8.3 + 4.0%. The energy disposal into the ν₃ mode of the CO₂ product was also measured. A value of 〈f_ν(3)〉 = 5.9 ± 2.0% was determined. The results are consistent with formation of a long-lived O₂NNCO collision complex with a roughly statistical distribution of internal energy. Concerted dissociation via a four-center transition state leads to the primary products.