## Abstract

Vibrationally excited carbon monoxide was produced by flashing mixtures of nitric oxide, carbon monoxide and nitrogen. The rate of formation and decay of the vibrationally excited molecules was interpreted by means of the processes: $\mathrm{NO} (X^2 II, v = 0) + h\nu \rightarrow \mathrm{NO} (A^2 \Sigma^+, v = 0. 1, 2),$ $\mathrm{NO} (A^2 \Sigma^+, v = 0, 1, 2) + M \rightarrow\rightarrow \mathrm{NO} (X^2 II, v = 1) + M,$ $\mathrm{NO} (A^2 \Sigma^+, v = 0, 1, 2) \rightarrow\rightarrow \mathrm{NO} (X^2 II, v = 1) + h\nu,$ $\mathrm{NO} (X^2 II, v = 1) + \mathrm{CO}X^1 \Sigma^+ (v = 0) \rightleftarrows \mathrm{NO} (X^2 II, v = 0) + \mathrm{CO} (X^1 \Sigma^+, v = 1),$ $\mathrm{CO} (X^1 \Sigma^+, v = 1) + \mathrm{N}_2 X^1 \Sigma^+_g (v = 0) \rightleftarrows \mathrm{CO} (X^1 \Sigma^+, v = 0) + \mathrm{N}_2(X^1 \Sigma^+_g, v = 1),$ $\mathrm{NO} (X^2 II, v = 1) + \mathrm{NO}X^2 II(v = 0) \rightarrow 2\mathrm{NO} (X^2 II, v = 0).$