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September 2024 issue
Cover illustration: In this issue, Morawiec [Acta Cryst. (2024), A80, 379–386] considers the theory underlying the determination of a crystal lattice from neutron transmission spectra. Such spectra contain Bragg dips, i.e. minima at wavelengths corresponding to diffraction reflections. By recording the positions of the dips as the crystal is rotated about a fixed axis, one obtains a pattern of sinusoids as sketched in the lower part of the cover image. Methods are described for indexing such patterns. It is shown that the crystal lattice can be determined unambiguously only if the axis of sample rotation is inclined to the neutron beam.
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The instrumental resolution function for pair distribution functions (PDFs) with 2D detectors is expressed and used to simulate the impact of various parameters on experimental PDF data sets.
A method is presented for arriving at uniform edge-n-colorings of uniform tilings using concepts in group theory and color symmetry theory.
Neutron transmission spectra of a rotating crystal carry information about its lattice. The relationship between Bragg-dip positions in the spectra and the crystal lattice is investigated theoretically, and schemes for unambiguous determination of crystal orientation and lattice parameters are presented.
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Boolean conditions are derived from the structure-factor equation, relating distortions of a prototype perovskite structure to the emergence of superstructure reflections.
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