Abstract

The previously demonstrated nonintrusive time-of-flight molecular velocity tagging method, hydroxyl tagging velocimetry (HTV), has shown the capability of operating both at room temperature and in flames. Well-characterized jets of either air (nonreacting cases) or hydrogen–air diffusion flames (reacting cases) are employed. A 7 × 7 OH line grid is generated first through the single-photon photodissociation of H2O by a ~193 nm pulsed narrowband ArF excimer laser and is subsequently revealed by a read laser sheet through fluorescence caused by A2+(v′ = 3) ← X2Πi(v″ = 0), A2+(v′ = 1) ← X2Πi(v″ = 0), or A2+(v′ = 0) ← X2Πi(v″ = 0) pumping at ~248, ~282, or ~308 nm, respectively. A detailed discussion of the spectroscopy and relative signal intensity of these various read techniques is presented, and the implications for optimal HTV performance are discussed.

© 2005 Optical Society of America

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