Journal article

Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry

Riziq A, Trainic M, Erlick C, Segre E, Rudich Y ...see all

Atmospheric Chemistry and Physics, vol. 8, issue 6 (2008) pp. 1823-1833

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Abstract

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. For this purpose, we use nigrosin, an organic black dye, as a model absorbing core and two non-absorbing organic substances as shells, glutaric acid (GA) and Di-Ethyl-Hexyl-Sebacate (DEHS). The measured behavior of the coated particles is consistent with Mie calculations of core-shell particles. Errors between measured and calculated values for nigrosin coated with GA and DEHS are between 0.5% and 10.5% and between 0.5% and 9%, respectively. However, it is evident that the calculations are in better agreement with the measured results for thinner coatings. Possible reasons for these discrepancies are discussed.

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Authors

  • A. Abo Riziq

  • M. Trainic

  • C. Erlick

  • E. Segre

  • Y. Rudich

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