The properties of microwave rotational spectroscopy that make it a promising technique for gaseous pollutant monitoring are presented. Recent advances in instrumentation and technique that have suggested feasibility of in-situ monitoring are thoroughly discussed. A laboratory model of a potentially portable Gunn-diode cavity spectrometer has been interfaced to the atmosphere by way of a multistaged membrane separator. Results of testing this system under controlled experimental conditions as a specific monitor for two common gaseous pollutants are given. Determinations of the optimum sensitivity, specificity, and stability expected for this system are dsciussed along wih considerations for its calibration.
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