Abstract

Total collisional removal rate constants for the CH A²Δ and B²∑⁻ electronic states are obtained in low pressure (<20-Torr) hydrocarbon flames. The B state is consistently removed ~70% faster than the A state. Variations of ±50% are observed for different rotational levels and positions in the flame. For these flames, A-state emission following excitation of the B state indicates a rapid electronic-to-electronic energy transfer pathway that is insensitive to collision environment. Upper limits to the collider specific cross sections are obtained for H₂O, N₂, and CO₂. The CH concentration and temperature profiles are measured and parametrized using a unique method.

© 1988 Optical Society of America

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