Multiple scattering of light in a system of interacting Brownian particles

Abstract

The multiple scattered light from a system of interacting Brownian particles, both polarised and depolarised, is studied experimentally by means of correlation spectroscopy. Results obtained in a range of medium to high particle concentration are reported. The first cumulant has different values for the polarised and depolarised components. For two different concentrations the angular dependence of the multiple scattering is measured. Due to the particle interaction, the decay times show a remarkable angular dependence. The results are discussed on the basis of recent theories. A method is proposed to correct the correlation functions of parallel polarised scattered light for multiple scattering which will be applicable for small spherical scatters.