Scattering and absorption cross sections of compounded spheres III Spheres containing arbitrarily located spherical inhomogeneities

Abstract

The theory of light scattering by spheres possessing one or more spherical inhomogeneities is developed. The inhomogeneities, or subspheres, are of uniform but otherwise arbitrary composition and are restricted in size and number by only the volume of the host. Numerical results for single inclusions are considered in regard to questions that have arisen in the course of recent experimental research on morphology-dependent resonances in droplets. The modification of the light-absorbing properties of carbon by its entrainment in droplets is also studied. The predicted absorption by mass of soot particles in cloud droplets tends to be higher when the particles are centered in the droplets than when the more realistic eccentric inclusion model is used. Absorption by carbon that is internally mixed in sulfate hazes is more sensitive to the relative sizes of the sulfate and carbon particles, but absorption by eccentrically included grains tends not to differ greatly from that predicted by concentric models.