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Corona discharge atmospheric pressure ionization (API) source, developed in our lab, is coupled with a commercially available linear ion trap mass spectrometer for real time gas analysis. The H 2 O .+ (H 2 O) was observed and used to detect ethanol for the first time. The main reagent ions are m/z 36, m/z 37, and m/z 55 produced by corona discharge in humid nitrogen, and m/z...
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