AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Universal Description of Light Scattering by Irregularly Shaped Particles
YULI HEINSON, Justin Maughan, William Heinson, Amit Chakrabarti, Chris Sorensen, Kansas State University
Abstract Number: 107 Working Group: Aerosols, Clouds, and Climate
Abstract We report a universal and coherent description of light scattering by non-spherical, non-fractal, irregularly shaped particles. We built our experimental apparatus to detect scattering light at 31 angles simultaneously, starting from a small angle of 0.32$^° to 157$^°. We applied Q-space analysis to the phase function for the data from both our group and others. Q-space analysis uncovers patterns common to all particles: a q-independent forward scattering regime is followed by a Guinier regime, a power law regime with quantifiable exponents, and sometimes an enhanced back scattering regime. Moreover, the power law exponents have a universal functionality with the internal coupling parameter rho$^' where rho$^'=2kR|(m$^2-1)⁄(m$^2+2)|. The absolute value of the exponents start from 4 when rho$^' is small. As rho$^' increases, the exponents decrease until the trend levels off at rho$^'≳10 where the exponents reach a constant 1.75±0.25. All the non-spherical, non-fractal, irregularly shaped particles fall on the same trend regardless of the detail of their structure.