Abstract
A dynamic light scattering study is performed on colloidal crystals of spherical latex particles which are made of a fluorinated polymer (PFA) and are almost index-matched with the solvent. The PFA particles possess a partially crystalline internal structure which makes them optically anisotropic. The correlation function of depolarized scattered light is related to single-particle motion. We find that the translational motion of the particle within the crystal can be closely described as a Brownian motion in a harmonic potential well, and we derive the root-mean-square displacement of the particle. The translational correlation function presents also a long-time diffusive tail presumably associated with particle hopping between neighboring sites. The rotational motion is characterized by a short-time rotational diffusion coefficient larger than the long-time value, the latter being rather close to the value measured for the free particle in dilute solution.
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