Abstract
Abstract Low concentrations of SO2 in air were measured using a Stark modulated microwave spectrometer. Measurement of the intensity of absorption lines for rotational transitions gives a quantitative measure of the concentration of specific small molecules. Concentrations of 20 ppm of SO2 In air were easily detected with a signal-to-noise ratio of over 20/1 with a 5 sec time constant using a straightforward sample concentration technique.
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