Light scattering spectrum of a suspension of interacting Brownian macromolecules

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Abstract
The joint effect of direct and hydrodynamic interactions on the dynamic structure S (k,t) of a solution of rigid macromolecules is examined. The initial slope dS/dt and initial curvature d2 S/dt2 of S(k,t) are obtained. The reference frame correction of Kirkwood et al. [J. Chem. Phys. 33, 1505 (1960)] is shown to be wave‐vector dependent. Contrary to some previous results, we argue that the initial slope of S(k,t) is partly due to direct interparticle interactions rather than being due entirely to free‐particle Brownian motion