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A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia

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Fig. 1a. The NHsurements, (ii) the CIMS flow reactor where ion-molecule reactions occur, and (iii) the vacuum regions of the mass spectrometer including3-CIMS system consists of the following three parts: (i) a sampling inlet used for ambient, background and calibration mea-a collision dissociation chamber (CDC), an octopole ion guide, a quadrupole mass filter and a channeltron detector.
Fig. 1b. A schematic diagram of the inlet of KSU NHmeasurements, the added calibration gases were removed by the suck back flow through a solenoid valve (red arrow), to reduce perturbationof flow
Table 1. A summary of NH3-CIMS instruments found in the literature, with regard to sampling inlet and CIMS detection conditions.Included here are the configuration of the 3-way valve used to switch between the ambient and calibration mode; temperature, flow rate, totallength and inner diameter of the sampling inlet; residence time for ambient measurements through the inlet; pressure and residence time inthe CIMS flow tube reactor; the reagent ion used for analysis; sensitivity, background, and time response of the CIMS instrument.
Figure 1b illustrates the inlet system used during the fall 2009measurements. The outer portion of the inlet consisted of a65 cm, 0.635 cm O.D
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