Abstract

We present a novel techique, photoionization controlled-loss spectroscopy (PICLS), for obtaining relative changes in the fluorescence transition probability ( A + Q) under conditions where conventional measurements of the fluorescence lifetime are not feasible. Using PICLS, vertical profiles of relative changes in the transition probability have been measured in 20-torr premixed flat H 2/O 2/N 2 flames under stoichiometric and fuel-rich conditions. We compare these profiles with predictions from kinetic theory and discuss the implications of this comparison on quantitative fluorescence measurements of atomic hydrogen in flames.

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