Experimental study of chlorine atom interaction with acetylene behind shock waves

Abstract

Using atomic resonance absorption spectroscopy, we measure the temporal profiles of Cl atom concentration at interaction with acetylene behind shock waves. We used CCl4 thermal decay as the chlorine atom source. We used a 30 ppm of CCl₄ and 300 ppm of C₂H₂ in argon mixture for the experiments, at 1400–2300 K and pressures of about 2 bar. For experimental results, we determine the rate constant of the chlorine atom consumption in the Cl + C₂H₂ = C₂H + HCl reaction. The experimental data show essentially lower activation energy than the results of the theoretical calculations performed earlier, possibly due to the acetylene molecule vibrational energy contributing to overcoming the reaction barrier.