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A colloidal crystal formed by spherical latex particles possessing intrinsic optical anisotropy is studied by light scattering. Dynamic depolarized scattering gives information about the ``self-motion'' of particles within the crystal. It is found that the particles behave as Brownian harmonic oscillators with a finite escape time from the potential well. The mean-square dispalcement of the particle within the crystal is obtained from the experimental data. It is also found that the short time rotational diffusion rate in the colloidal crystal is larger than in the dilute suspension.
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Piazza et al. (1991) studied this question.
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