Abstract
Time-resolved fluorescence measurements are reported for the OH radical in premixed, laminar atmospheric-pressure flames, following excitation of the ν′=1 and ν′=0 levels of the A 2Σ + state. OH radicals were excited using a picosecond dye laser system based on the distributed feedback principle. Fluorescence was detected with a gated streak camera coupled to a CCD camera and temporal analyser. For ν′=0 excitation, a very weak dependence on lifetime was observed with initially excited rotational level N′ in the range N′=1 to 15. In the case of ν′=1 excitation, the lifetime increased by up to 15% in the range N′=5 to 14. The stoichiometry range 0.8–1.26 was reinvestigated; with the improved precision of the present data, a 13% decrease in lifetime could be observed over this range.
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