Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry
Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry
复制标题
通过腔衰荡气溶胶光谱法测量涂层吸收气溶胶的消光效率
DOI：
10.5194/acp-8-1823-2008
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发表时间：
2007
影响因子：
6.3
通讯作者：
Y. Rudich
中科院分区：
文献类型：
--
作者：
A. A. Riziq;M. Trainic;C. Erlick;E. Segre;Y. Rudich
在这项研究中，我们测量的消光效率在532 nm的吸收气溶胶颗粒涂有非吸收固体和液体有机壳涂层厚度在5和100 nm之间变化，使用腔衰荡气溶胶光谱。为此，我们使用有机黑色染料苯胺黑作为模型吸收核，并使用两种非吸收性有机物质作为壳，即谷氨酸（GA）和癸二酸二乙酯（DEHS）。包覆颗粒的测量行为与核-壳颗粒的米氏计算一致。GA和DEHS涂布的苯胺黑的实测值与计算值之间的误差分别在0.5%~ 10.5%和0.5%~ 9%之间。然而，很明显，对于较薄的涂层，计算与测量结果更一致。这些差异的可能原因进行了讨论。
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.