Steady-State Assumption and the Dissociation of Br2 in Shock Waves

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Abstract
The rate of dissociation of Br 2 molecules in an excess of argon has been measured, using a method based on determination of the emission intensity behind the shock front. The emission is a function of the concentration of bromine atoms and is insensitive to the state of vibrational excitation of Br 2 . There is a fair agreement over a wide temperature range between the new data and the data of previous investigators. However, at the lowest and the highest temperatures attainable, the rate constants obtained by the previous investigators are about twice the rate constants obtained by the new method. This discrepancy exceeds the standard deviation of experimental results and may be tentatively explained by assuming that in previous investigations, the combined rate of vibrational relaxation and dissociation was observed, while in the present work, the true dissociation rate constants were determined.

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