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We have developed a compact instrument for sensitive, rapid and continuous measurement of trace gases in air, with the focus here on ammonia. This instrument takes advantage of recent technology in quantum cascade (QC) lasers and infrared detectors, which allows high sensitivity to ammonia, 0.2 ppb (0.2times10-9) of NH3 in air in 1 s without cryogenic liquids. One may substitute a QC laser operating...
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