Thermal Decomposition of Cyanogen Bromide Measured in BrCN/O2/Ar Reaction System by Atomic Resonance Absorption

Abstract

AbstractThe thermal decomposition of cyanogen bromide has been measured in the temperature range 1640—2260 K at pressures of about 3.8–4.5 bar using the shock tube technique. Mixtures of BrCN/O2 highly diluted in argon were heated by reflected shock waves and O atom concentrations were monitored in the post shock reaction zone by using Atomic Resonance Absorption Spectroscopy (ARAS). Because of the fast secondary reactions of the dissociation product CN, the rate coefficient for the dissociation of cyanogen bromide could be experimentally determined from the measured O atom concentrations. They are closely fit by the Arrhenius expression: The present rate coefficient data is in good agreement with the result recommended by Baulch et al. [6]