Figure 1
The two-dimensional neutron scattering pattern from opal taken at a wavelength of 10 Å, showing the variation in the resolution of the 111 peak. The weak second diffraction peak at a scattering vector that is (8/3)1/2 [asymptotically equal to] 1.61 times that of the first-order peak is consistent with a system of close-packed lattice of noncrystalline silica spheres (Sosnowska & Shiojiri, 1999BB7). (The incident beam without the sample is superimposed on the beam stop.)  [article HTML]

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