Abstract
An experimental method based on the detection of the enhancement of chemi-ionization following the pulsed laser excitation of CH*(A 2Δ, B 2Σ −) radicals is described. This approach provides conclusive and direct observations of chemi-ionization reactions involving CH*(A 2Δ, B 2Σ − radicals. The results suggest that the rate constants for the reactions CH*(A 2Δ, B 2Σ −) + O − HCO + + e − are approximately 2000 times faster at 2100 K than the previously measured rate constant for the reaction CH(X 2Π) + O → HCO + + e − which is believed to be a primary source of chemi-ionization in all hydrocarbon flames.
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