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.

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