Abstract

Laser-induced fluorescence measurements of SrOH have been made in a fuel-rich sooting atmospheric pressure C2H4/air diffusion flame seeded with a strontium salt. The dependence of fluorescence intensity on laser spectral intensity was observed to reach near full saturation at a laser spectral intensity of 1010 W/cm2 cm−1. To our knowledge, this is the first observation of the saturated fluorescence of a polyatomic species in a flame. The precise conditions in which saturation can be observed, and the factors which hinder its observation, are discussed in detail. Comparisons are made with OH fluorescence measurements in the same flame.

© 1989 Optical Society of America

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