Abstract
This paper gives an account of an experimental study on the temporal and spatial evolution of the plasma in methane produced by the impact of TEA-CO2 laser radiation. The preliminary analysis of this plasma by mass spectroscopy and ir spectroscopy show that acetylene and hydrogen are the dominant gaseous products. This is conform with other types of methane pyrolysis which include fast quenching. The temporal evolution of the plasma formation as well as the shock-wave generation and expansion are investigated by Schlieren high-speed photography and Mach-Zehnder interferometry. The temporal and spatial variation of the distributions of the C2, (a3πu), CH(X2 πr), and C3(1∑g) radicals in the plasma are measured with the aid of laser-induced fluorescence. These experimental methods yield a detailed picture of the temporal evolution of the laser-induced plasma and give an insight into the reaction kinetics. The dominant reaction process is fast heating in the shock wave and a subsequent rapid quenching.
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