An experimental verification of incoherent light scattering

Dynamic light scattering from two liquidlike ordered latex suspensions with particle diameters 85 and 109 nm, as well as the scattering from a 4:1 mixture of these suspensions are investigated. Both the static structure factor SM(K) and the intermediate scattering function FM(K,τ) of the mixture strongly deviate from those of the neat suspensions at low scattering angles. This discrepancy is discussed in terms of an incoherent light scattering contribution due to scattering-power polydispersity of the mixture. Our experiments confirm theoretical expressions recently derived by Pusey et al.