Abstract

Collisional vibrational energy transfer from the predissociative v′ = 3 level of the OH A ∑⁺ state was studied with laser-induced fluorescence. For CH₄/O₂, CH₄/air, and H₂ /O₂ flames at pressures ranging from 14 to 760Torr, the v′= 3 level was excited, and transfer into the lower v′ = 0, 1, 2 levels was measured. Energy transfer occurred in all flames, as exemplified by the 760-Torr CH₄ /air flame in which only 30% of the total ultraviolet fluorescence emitted came from the initially excited v′ = 3 level. For quantitative measurements, one must either correct for vibrational energy transfer or alter the detection strategy to collect only fluorescence emitted by v′ = 3

© 1993 Optical Society of America

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