Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 6 2008 10.5194/acp-8-1823-2008 http://www.atmos-chem-phys.net/8/1823/2008/ http://www.atmos-chem-phys.net/8/1823/2008/acp-8-1823-2008.html http://www.atmos-chem-phys.net/8/1823/2008/acp-8-1823-2008.pdf 1823 1833 2008-03-26 Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry A. Abo Riziq M. Trainic C. Erlick E. Segre Y. Rudich yinon.rudich@weizmann.ac.il Department of Environmental Sciences, Weizmann Institute, Rehovot, 76100, Israel Department of Atmospheric Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel Physics Services, Weizmann Institute, Rehovot, 76100, Israel In this study, we measure the extinction efficiency at 532 nm of absorbing aerosol particles coated with a non-absorbing solid and liquid organic shell with coating thickness varying between 5 and 100 nm using cavity ring down aerosol spectrometry. 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