Impacts of Functional Group Identity on SOA Yields and Kinetics

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"Much of the uncertainty in climate and air quality modeling derives from the challenges of modeling organic aerosol, particularly the Secondary Organic Aerosol (SOA) fraction, which is formed by the oxidation of gas phase species to low-volatility products that partition into aerosol. Previous work has established that the structure of the parent compounds is key to determining the kinetics and vapor pressures of later products and therefore SOA yields. This work extends that analysis by comparing six molecules, each with a single functional group on a ten-carbon chain, under the same conditions to determine their relative SOA yields. SOA was generated from each precursor VOC in an environmental chamber via reaction with OH under low and high NOx conditions and the concentration of particles produced was measured. Experimental data is supplemented with results of kinetics modeling of first-generation aerosol products and volatility measurements for each major product. In all conditions tested, cyclodecane makes the most SOA, followed by 1-decene, 2-decanone, and decane. This is consistent with the expected yields for these compounds based on the branches in their mechanisms, vapor pressures of initial products, and likelihoods of fragmentation. Yields for 2-decanol and 2-decylnitrate have significant uncertainty due to errors in the collection of gaseous compounds. "

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OBJ OBJ datastream * 1.66 MiB application/pdf 2021-05-26
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* We're sorry. Some content is restricted until Monday 26th of May, 2031.
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