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Science Lecture by Greg Huey |
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Date: February 22, 2006
Time: 2:00pm
Location: NIA, Rm 137
Applications of Chemical Ionization Mass Spectrometry to Atmospheric Chemistry
Greg Huey, Georgia Institute of Technology
During the last seven years our research group has developed chemical ionization mass spectrometric (CIMS) techniques for the measurement of a wide range of atmospheric species. In this talk, I will discuss CIMS data from three field campaigns: eddy flux measurements of PANs in Duke Forest; HOx observations from Summit, Greenland; and gas-phase ammonia measurements from the Atlanta Nucleation Experiment. These data sets highlight the unique selectivity, sensitivity, and fast time response of CIMS. The PAN measurements were performed with an integration period of 0.25 s (4 Hz) to allow us to measure fluxes by eddy covariance. The fast time response of the Atlanta ammonia measurements (1 min) allowed us to examine its role in particle nucleation as well as test our understanding of urban ammonia sources. The sensitivity of the CIMS is crucial for measurement of short lived species such as HO2 radicals. Finally, I will present new CIMS methods for measuring particulate sulfate and oxalate with high sensitivity and specificity.
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