TDLAS-based photofragmentation spectroscopy for detection of K and KOH in flames under optically thick conditions

Florian Schmidt & Emil Thorin
Photofragmentation spectroscopy is combined with tunable diode laser absorption spectroscopy to measure the line shape of the fragment species. This provides flexibility in choosing the UV pulse location within the line shape and accurate quantification of both target species and background fragment concentrations, even under optically thick conditions. The technique is demonstrated by detection of potassium hydroxide (KOH) and atomic potassium, K(g), above solid KOH converted in a premixed methane-air flat flame. Time series of...
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