We have measured the extinction and absorption cross sections of carbon particles emitted by a propane diffusion flame both in an aerosol chamber and on size-segregated samples deposited on optical windows. The absorption cross section, the single scattering albedo, and the Ångström exponent show drastic dependencies both on the C/O ratio and on the particle size. This is interpretated as being due to the appearance of nucleation modes of smaller organic particles at higher C/O ratios, which were detected by SMPS measurements and partially by TEM analysis. The spectral range of the validity of the absorption power-law (Ångström exponent) model is investigated by vacuum ultraviolet extinction measurements. These measurements give also indications for a preferentially aromatic nature of the OC component of the flame products.
CITATION STYLE
Schnaiter, M., Gimmler, M., Llamas, I., Linke, C., Jäger, C., & Mutschke, H. (2006). Strong spectral dependence of light absorption by organic carbon particles formed by propane combustion. Atmospheric Chemistry and Physics, 6(10), 2981–2990. https://doi.org/10.5194/acp-6-2981-2006
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