Abstract
We study orientational relaxation in a suspension of directed spheres interacting with a Heisenberg pair interaction. Translational diffusion is neglected. Rotational diffusion is described by a generalized Smoluchowski equation. The wave-number- and frequency-dependent diffusion coefficient characterizing the decay of the rotational dynamic scattering function is calculated to first order in volume fraction. The single-particle orientational correlation function is evaluated to the same order.
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