AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
The Light Scattering Internal Coupling Parameter for Aggregates of Particles
CHRIS SORENSEN, Kansas State University
Abstract Number: 316 Working Group: Aerosol Physics
Abstract It is often found that scattering and absorption of light by aggregates of particles is well (but not perfectly) described by the diffraction, or Rayleigh-Debye-Gans (RDG), limit. This can be understood qualitatively by the fact that aggregates can have considerable free volume within their rough perimeters, thus “diluting” the refractive nature of the material. Our group has recently introduced the internal coupling parameter which is successful in parameterizing light scattering by non-aggregate particles of arbitrary shape including spheres. Here we describe an extension of this parameter to aggregates, both fractal and non-fractal, that successfully parameterizes the scattering and indicates when deviations for RDG will occur. For uniform, non-fractal aggregates this approach limits to the Maxwell–Garnett mixing theory description.