Electron collision quenching of CO(v) chemiluminescence in CS2/O2 and CS2/O2/N2O flames
Chemiluminescence from vibrationally excited carbon monoxide formed by the reaction CS+O-->CO(v)+S was observed in CS2/O2 and CS2/O2/N2O flames to which an electric discharge was applied. Although the total amount of chemiluminescence increased with increasing discharge current probably due to enhanced reaction rates as a result of radical formation, the vibrational distribution was quenched, becoming thermal in character. The thermalization is attributed to superelastic electron collisions [e+CO(v)-->e+CO(v−1)]. The technique demonstrates a sensitive method for detecting collisional transfers between excited states by separating the perturbation (electron collisions) from the initial excitation mechanism (chemical reactions).
Copyright © 1981 American Institute of Physics. (Recieved 9 January 1981; accepted for publication 9 March 1981) The authors would like to thank Dr. A.A. Vetter for his helpful comments and support and Dr. P.J. Hargis for his review of the manuscript. This work was supported by the United States Department of Energy and the California Institute of Technology, Division of Engineering and Applied Science.