LASER INDUCED FLUORESCENCE SPECTROSCOPY IN FLAMES - TO SATURATE OR NOT TO SATURATE? THAT IS THE QUESTION.
Creators:Daily, J. W.
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Publisher:Ohio State University
Laser induced fluorescence spectroscopy has been shown to be an effective tool for measuring radical species concentrations in flames. For quantitative measurements, however, the collisional transfer rates for the excited state must be known if the observed excited state population is to be related to the undisturbed population. Saturation of the pumped transition can lead to simplification of the rate equation system describing the non-equilibrium population distribution and larger fluorescence signals. Conversely, large departures from equilibrium can increase the effect of excited state chemistry, complicating signal interpretation. The talk will discuss the laser induced fluorescence process for diatomic radicals in flames. The saturation phenomena will be described and limiting cases outlined. A rational for choosing a laser source and experimental operating conditions will be discussed.
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