The evaluation of the natural spontaneous emission of photons from particles in gaseous systems is one of the oldest optical measurement techniques for the determination of concentrations and temperatures. In 1857 Swan investigated the light emission of hydro-carbon flames and found distinct structures in the spectrally resolved emissions. The observed emissions in the visible range which are between 430 and 620 nm originated from C2 molecules, as was found later. In any case these observations formed the basis for further investigations, mainly in high-temperature reacting environments.
KeywordsDiffusion Flame Rotational Transition Interference Filter Liquid Hydrogen Band Head
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