Shock tube study of cyanogen oxidation kinetics

Mixtures of cyanogen and nitrous oxide diluted in argon were shock‐heated to measure the rate constants of equation image A broad‐band mercury lamp was used to measure CN in absorption at 388 nm [ B 2 Σ + ( v = 0) ← X 2 Σ + ( v = 0)], and the spectral coincidence of a CO infrared absorption line [ v (2 ← 1), J (37 ← 38)] with a CO laser line [ v (6 → 5), J (15 → 16)] was exploited to monitor CO in absorption. The CO measurement established that reaction (3) produces CO in excited vibrational states. A computer fit of the experiments near 2000 K led to An additional measurement of NO via infrared absorption led to an estimate of the ratio k 5 / k 6 : equation image with k 5 / k 6 ≃ 10 3.36±0.27 at 2150 K. Mixtures of cyanogen and oxygen diluted in argon were shock heated to measure the rate constant of equation image and the ratio k 5 / k 6 by monitoring CN in absorption. We found near 2400 K: and The combined measurements of k 5 / k 6 lead to k 5 / k 6 ≃ 10 −3.07 exp(+31,800/ T ) (±60%) for 2150 ≤ T ≤ 2400 K.