Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 9 2009 10.5194/acp-9-3049-2009 http://www.atmos-chem-phys.net/9/3049/2009/ http://www.atmos-chem-phys.net/9/3049/2009/acp-9-3049-2009.html http://www.atmos-chem-phys.net/9/3049/2009/acp-9-3049-2009.pdf 3049 3060 2009-05-12 Secondary organic aerosol formation from photooxidation of naphthalene and alkylnaphthalenes: implications for oxidation of intermediate volatility organic compounds (IVOCs) A. W. H. Chan K. E. Kautzman P. S. Chhabra J. D. Surratt M. N. Chan J. D. Crounse A. Kürten P. O. Wennberg R. C. Flagan J. H. Seinfeld seinfeld@caltech.edu Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA, USA Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA current affiliation: Institute for Atmospheric and Environmental Sciences, Goethe-University Frankfurt am Main, Frankfurt, Germany Current atmospheric models do not include secondary organic aerosol (SOA) production from gas-phase reactions of polycyclic aromatic hydrocarbons (PAHs). Recent studies have shown that primary emissions undergo oxidation in the gas phase, leading to SOA formation. This opens the possibility that low-volatility gas-phase precursors are a potentially large source of SOA. In this work, SOA formation from gas-phase photooxidation of naphthalene, 1-methylnaphthalene (1-MN), 2-methylnaphthalene (2-MN), and 1,2-dimethylnaphthalene (1,2-DMN) is studied in the Caltech dual 28-m³ chambers. Under high-NO_x conditions and aerosol mass loadings between 10 and 40 μg m^−3, the SOA yields (mass of SOA per mass of hydrocarbon reacted) ranged from 0.19 to 0.30 for naphthalene, 0.19 to 0.39 for 1-MN, 0.26 to 0.45 for 2-MN, and constant at 0.31 for 1,2-DMN. Under low-NO_x conditions, the SOA yields were measured to be 0.73, 0.68, and 0.58, for naphthalene, 1-MN, and 2-MN, respectively. The SOA was observed to be semivolatile under high-NO_x conditions and essentially nonvolatile under low-NO_x conditions, owing to the higher fraction of ring-retaining products formed under low-NO_x conditions. 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