Reactions of Bromide Ions with Atmospheric Trace Gases and Aerosols
Thompson, Andrea Elizabeth
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I investigated the utility of Br- as a chemical ionization mass spectrometry (CIMS) reagent ion for the detection and measurement of both atmospheric trace gases and aerosol species. The primary goals of this study are to obtain fast, very sensitive measurements of nitrate and sulfate and to ascertain if gas phase PAN and HNO3 could be measured simultaneously with the same chemical ionization scheme. Gas-phase measurements of PAN and nitric acid were conducted and the sensitivities of these measurements to temperature and relative humidity were determined. The potential for measuring aerosol composition by CIMS was assessed by comparison with PILS (particle-into-liquid sampler) measurements.