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

A. Abo Riziq, M. Trainic, C. Erlick, E. Segre, Y. Rudich*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

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.

Original languageAmerican English
Pages (from-to)1823-1833
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume8
Issue number6
DOIs
StatePublished - 13 Mar 2008

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