21 June 2015 The optical properties of tropospheric soot aggregates determined with the DDA (Discrete Dipole Approximation) method
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Abstract
Black carbon particles soon after emission interact with organic and inorganic matter. The primary goal of this work was to approximate the accuracy of the DDA method in determining the optical properties of such composites. For the light scattering simulations the ADDA code was selected and the superposition T-Matrix code by Mackowski was used as the reference algorithm. The first part of the study was to compare alternative models of a single primary particle. When only one material is considered the largest averaged relative extinction error is associated with black carbon (δCext ≈ 2.8%). However, for inorganic and organic matter it is lowered to δCext ≈ 0.75%. There is no significant difference between spheres and ellipsoids with the same volume, and therefore, both of them can be used interchangeably. The next step was to investigate aggregates composed of Np = 50 primary particles. When the coating is omitted, the averaged relative extinction error is δCext ≈ 2.6%. Otherwise, it can be lower than δCext < 0.2%.
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Krzysztof Skorupski, Krzysztof Skorupski, } "The optical properties of tropospheric soot aggregates determined with the DDA (Discrete Dipole Approximation) method", Proc. SPIE 9526, Modeling Aspects in Optical Metrology V, 95260N (21 June 2015); doi: 10.1117/12.2184634; https://doi.org/10.1117/12.2184634
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