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July 2016 issue
Cover illustration: Understanding the organizational principles governing complex inorganic crystal structures helps the synthetic chemist to compete with nature in the preparation of new materials with desired architectures and properties [Eon, J.-G. (2016). Acta Cryst. A72, 268-293]. A projection of the 3-periodic structure obtained after deleting B and X vertices from garnet A3B2(XO4)3 is shown.
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In coherent diffraction experiments many diffraction images of randomly oriented particles are recorded and assembled into a three-dimensional scattering intensity distribution. In this paper a method is presented to test the consistency of the assembled three-dimensional distribution.
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The reflection group W can be specified by a connected Coxeter–Dynkin diagram consisting of either one or two orbits of W. An individual orbit is viewed as the set of vertices of a polytope (root polytope) generated by its W from any one point of the orbit.
Properties of X-ray resonant scattering in the Bragg case are revealed analytically using the Riemann surface.
New omit maps are introduced that delete some subvolume of the unit cell without analysing the electron density. Applied as periodic perturbations these significantly improve the stagnating behaviour of alternating-projection-type dual-space algorithms.
The focusing performances of bent Laue crystals are shown to be strongly sensitive to a small degree of asymmetry.
A periodic modulation of experimental conditions would affect both intensities and Bragg angles for the diffraction lines. A frequency response (a series of harmonics) has been derived analytically and compared with a simulated modulation experiment.
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