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USE OF A THERMAL DESORPTION PARTICLE BEAM MASS SPECTROMETER FOR STUDIES OF SECONDARY ORGANIC AEROSOL FORMATION

As part of a research program focusing on studies of the chemistry of gas-to-particle conversion, we have recently developed a new instrument for particle chemical analysis. This instrument, which we refer to as a thermal desorption particle beam mass spectrometer (TDPBMS), can be used for real-time, quantitative analysis of the components of organic particles, at least within the ~0.02-0.5 micrometer size range. We have also developed a temperature-programmed TDPBMS technique to aid in compound identification. Here we describe the operation of the TDPBMS and present results from our recent application of TDPBMS to studies of the chemistry of secondary aerosol formation, in which we have analyzed the composition of aerosol particles formed in environmental chamber reactions of 1-tetradecene and ozone in the presence of alcohols, carboxylic acids, and water vapor.