  Frequency domain super-heterodyne laser light scattering is utilized in a low
angle integral measurement configuration to determine flow and diffusion in
charged sphere suspensions showing moderate to strong multiple scattering. We
introduce an empirical correction to subtract the multiple scattering
background and isolate the singly scattered light. We demonstrate the excellent
feasibility of this simple approach for turbid suspensions of transmittance
T>0.4. We study the particle concentration dependence of the electro-kinetic
mobility in low salt aqueous suspension over an extended concentration regime
and observe a maximum at intermediate concentrations. We further use our scheme
for measurements of the self-diffusion coefficients in the fluid samples in the
absence or presence of shear, as well as in polycrystalline samples during
crystallization and coarsening. We discuss the scope and limits of our approach
as well as possible future applications.
