Journal ArticleDOI
Light scattering and absorption by fractal aggregates including soot
Christopher M. Sorensen,Jérôme Yon,Fengshan Liu,Justin B. Maughan,William R. Heinson,Matthew J. Berg +5 more
TLDR
In this article, the authors studied the effects of the variables of monomers per aggregate, which ranged from one to 502, two monomer size parameters of 0.157 and 0.314, and a wide range of refractive index real and imaginary parts.Abstract:
This paper addresses how well and under what conditions the Rayleigh-Debye-Gans (RDG) approximation describes scattering and absorption of light by fractal aggregates (FA) including soot. The RDGFA theory, which is the prevailing, first order description of this problem, has two assumptions: the monomers, or primary particles, of the aggregate scatter and absorb in the Rayleigh regime, and the aggregate scatters in the diffraction limit weighted by this Rayleigh scattering and absorbs as a system of independent monomer particles. The aggregates studied here are formed via Diffusion Limited Cluster Aggregation (DLCA) and have a fractal dimension D = 1.78 ± 0.04 and prefactor of k0 = 1.35 ± 0.10. The aggregates are a collection of monodisperse spherical monomers with point contacts. Optical calculations were performed with the multiple sphere T-matrix (MSTM) and DDSCAT codes for incident light polarized perpendicular to the scattering plane. The scattering considered is the forward scattering intensity and the angular scattering as parameterized by the scattering wave vector. The total absorption cross section for aggregates is also calculated. This work stresses the systematic study of the effects of the variables of monomers per aggregate, which ranged from one to 502, two monomer size parameters of 0.157 and 0.314, and a wide range of refractive index real and imaginary parts. It also considers soot refractive indices with three representative dispersions. A summary of results for both scattering and absorption includes deviations from RDGFA theory ranging as large as 35% with positive deviations increasing with the real part of the refractive index and negative deviations growing with the imaginary part. These deviation from the RDG limit are shown to be similar to deviations for spheres.read more
Citations
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Journal ArticleDOI
Review of recent literature on the light absorption properties of black carbon: Refractive index, mass absorption cross section, and absorption function
TL;DR: In this article, the optical properties of soot black carbon (BC) are used for the prediction of the radiative effects of freshly-emitted and aged carbonaceous particles.
Journal ArticleDOI
Comprehensive thematic T-matrix reference database: A 2014–2015 update
Michael I. Mishchenko,Nadezhda T. Zakharova,Nikolai G. Khlebtsov,Gorden Videen,Thomas Wriedt +4 more
TL;DR: This paper is the seventh update to the comprehensive thematic database of peer-reviewed T-matrix publications and includes relevant publications that have appeared since 2013 and lists a number of earlier publications overlooked previously.
Journal ArticleDOI
Modelling optical properties of atmospheric black carbon aerosols
TL;DR: In this article, a review of the state-of-the-art in numerical light-scattering methods for atmospheric black carbon (BC) aerosols is presented, along with some key lessons learned regarding those morphological properties that have a dominant impact on the optical properties.
Journal ArticleDOI
Comprehensive thematic T-matrix reference database: a 2017–2019 update
TL;DR: This compilation is the ninth update to the comprehensive thematic database of peer-reviewed T-matrix publications initiated in 2004 and lists relevant publications that have appeared since 2017 and includes a few earlier publications that has so far been overlooked.
Journal ArticleDOI
Black carbon aggregates: A database for optical properties
TL;DR: In this article, an accurate numerical model is used to calculate the single-scattering properties of BC clusters in the form of fractal aggregates, and the database can be used to give the scattering properties of aggregates with monomer number from 1 up to 3000, monomer size parameter from 0.05 to 0.5, real part of refractive index from 1.2 to 2.0, and imaginary part from 0 2 to 1.0.
References
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Journal ArticleDOI
Light Scattering by Small Particles
H. C. Van de Hulst,V. Twersky +1 more
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
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Journal ArticleDOI
Discrete-Dipole Approximation For Scattering Calculations
Bruce T. Draine,Piotr J. Flatau +1 more
TL;DR: In this article, the authors used the discrete-dipole approximation (DDA) for scattering calculations, including the relationship between the DDA and other methods, including complex-conjugate gradient algorithms and fast-Fourier transform methods.
Journal ArticleDOI
Light Absorption by Carbonaceous Particles: An Investigative Review
Tami C. Bond,Robert Bergström +1 more
TL;DR: The optical properties of light-absorbing, carbonaceous substance often called "soot", "black carbon", or "carbon black" have been the subject of some debate as discussed by the authors.
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