Forthcoming article in Acta Crystallographica Section A Foundations and Advances

Plesiotwins versus diperiodic twins
The reticular conditions for the occurrence of plesiotwins and diperiodic twins are systematically analysed.

Spatio-temporal symmetry – crystallographic point groups with time translations and time inversion
Spatio-temporal crystallographic point groups with time translations and time inversion are derived and tabulated.

A method to estimate statistical errors of properties derived from charge density modeling
Errors on molecular properties including topology of electron density and electrostatics are estimated from a sample of deviating models generated using the variance-covariance matrix issued at the end of the charge density refinement.

Comments on `A new theory for X-ray diffraction'

AFLOW-SYM: platform for the complete, automatic and self-consistent symmetry analysis of crystals

Surface embeddings of the Klein and the Möbius–Kantor graphs
Using a simple invariant representation scheme for graphs, a number of reticular networks are identified as surface embeddings of the famous Klein and Möbius–Kantor graphs on periodic surfaces.

Partially coherent ptychography by gradient decomposition of the probe
Partially coherent effects in ptychography are addressed by using a simple and efficient model with only one coherent probe, its gradient and the variance of a convolution kernel.

Dependence of X-ray plane-wave rocking curves on the deviation from exact Bragg orientation in and perpendicular to the diffraction plane for the asymmetrical Laue case
The dependence of X-ray rocking curves on the deviation angle from the exact Bragg orientation in the diffraction plane and in the direction perpendicular to the diffraction plane is investigated for the asymmetrical Laue case.

Shattered Symmetry. Group Theory From the Eightfold Way to the Periodic Table. By Pieter Thyssen and Arnout Ceulemans. Oxford University Press, 2017. Pp. 528. Price GBP 52.00 (hardback). ISBN 9780190611392.

The fundamentals of crystal orientation
New parametric equations are developed for crystal orientation, the solutions of which are free of constraints or approximations and are well suited for determination of crystal orientation with high accuracy and precision. These equations are validated and checked for orienting of single crystals with high precision and accuracy.

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