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| Titel |
Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry |
| VerfasserIn |
A. Abo Riziq, M. Trainic, C. Erlick, E. Segre, Y. Rudich |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 6 ; Nr. 8, no. 6 (2008-03-26), S.1823-1833 |
| Datensatznummer |
250005942
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| Publikation (Nr.) |
 copernicus.org/acp-8-1823-2008.pdf |
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| Zusammenfassung |
| 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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