Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-4727-2009 http://www.atmos-chem-phys-discuss.net/9/4727/2009/ http://www.atmos-chem-phys-discuss.net/9/4727/2009/acpd-9-4727-2009.html http://www.atmos-chem-phys-discuss.net/9/4727/2009/acpd-9-4727-2009.pdf 4727 4767 2009-02-24 Photodegradation of secondary organic aerosol generated from limonene oxidation by ozone studied with chemical ionization mass spectrometry X. Pan J. S. Underwood J.-H. Xing S. A. Mang S. A. Nizkorodov nizkorod@uci.edu Department of Chemistry, University of California – Irvine, Irvine, CA 92697–2025, USA Department of Chemistry, Loyola University, New Orleans, LA 70118, USA Kyoto University Pioneering Research Unit for Next Generation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD 2125, USA Photodegradation of secondary organic aerosol (SOA) prepared by ozone-initiated oxidation of D-limonene is studied with an action spectroscopy approach, which relies on detection of volatile photoproducts with chemical ionization mass-spectrometry as a function of the UV irradiation wavelength. Efficient photodegradation is observed for a broad range of ozone and D-limonene concentrations (0.1–300 ppm) used in the preparation of SOA. The observed photoproducts are dominated by oxygenated C1-C3 compounds such as methanol, formic acid, acetaldehyde, acetic acid, and acetone. 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