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A two-dimensional ultrasmall-angle x-ray-scattering apparatus was constructed with a full width at the half maximum of the intensity profile of the incident x-ray beam being about 17 s of arc. This apparatus enabled us to obtain the scattering intensity as a function of the scattering vector. The scattering profile of a colloidal crystal of silica particles in an aqueous dispersion was studied and analyzed with the aid of a method by Busing and Levy. The diffraction planes corresponding to 22 scattering peaks observed were uniquely identified; The lattice system was determined to be body-centered-cubic with a lattice constant of 3800 and its [11{}1] was parallel to the capillary axis.
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Konishi et al. (1998) studied this question.
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