Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 3 4 2010 10.5194/amt-3-1075-2010 http://www.atmos-meas-tech.net/3/1075/2010/ http://www.atmos-meas-tech.net/3/1075/2010/amt-3-1075-2010.html http://www.atmos-meas-tech.net/3/1075/2010/amt-3-1075-2010.pdf 1075 1087 2010-08-19 A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia D. R. Benson A. Markovich M. Al-Refai S.-H. Lee slee19@kent.edu Kent State University, Department of Chemistry, Kent, Ohio, USA Kent State University, Department of Computer Sciences, Kent, Ohio, USA This study presents a chemical ionization mass spectrometer (CIMS) for fast response, in-situ measurements of gas phase ammonia (NH₃). The NH₃ background level detected with the CIMS ranged between 0.3–1 ppbv, with an uncertainty of 30 pptv under optimized conditions. 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