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An optical method to monitor NO in air and exhaust gas has been investigated. In this method NO is excited by NO-γ-bands (A 2  Ʃ +  ← X 2  II r ) generated in a microwave discharge and is detected by its subsequent fluorescence. Results indicate a linear detection range from 7.5 ppb to 1000 ppm in air using a time response of 10 s. Interferences from other atmospheric constituents are found to be small. The analysis requires only a small amount of sample gas.

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Nachweis von atmosphärischem NO im ppb-Bereich mittels Fluoreszenzanregung durch NO-γ-Banden / An Optical Method to Monitor NO in Air, where NO Fluorescence is Excited by NO-γ Bands