Infra-red chemiluminescence from vibrationally excited CO. Part 2.—Product distribution from the reaction O + CS → CO + S

Abstract

A study has been made of the infrared chemiluminescence emitted from vibrationally excited CO formed in the reaction sequence: O + CS₂→SO + CS, O + CS→CO + S, when O atoms and CS₂, highly diluted in Ar, were mixed in a flow system. Relative vibrational populations were determined from the first overtone band spectra. Some of the relative rates at which CO is produced in different levels (R_v) were derived using a steady state analysis, in which the total rate of production of molecules in each vibrational level was equated to their total rate of removal. This gave: R₇∼0.1; R₈= 0.21; R₉= 0.49; R₁₀= 0.61; R₁₁= 0.73; R₁₂= 0.91; R₁₃= 1.0; R₁₄= 0.92; R₁₅= 0.3. The results are discussed briefly in terms of the molecular dynamics of the reactive encounters and the nature of the potential energy hypersurface for reaction.