Particle excursions in colloidal crystals.
We have performed synchrotron small-angle x-ray diffraction experiments on charge-stabilized colloidal crystals. The mean squared displacements, obtained from Debye-Waller factors, decrease with increasing density beyond freezing. Irrespective of the range of the repulsion, our data and previous results lie on a common curve, linearly scaled between the melting and close-packed densities. Surprisingly, the excursions are smaller than predicted by theory.
Megens
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M
Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, NL-1018 XE, Amsterdam, The Netherlands.
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