Spatial displacement of forward-diffracted X-ray beams by perfect crystals

The first experimental observation of transverse spatial echoes generated by forward Bragg diffraction of an X-ray beam propagating through a perfect thin crystal is reported.

The development of powder profile refinement at the Reactor Centre Netherlands at Petten

Around 1965 at the Reactor Centre Netherlands at Petten, Loopstra, van Laar and Rietveld developed `profile refinement'. Although Loopstra had the idea, van Laar worked it out mathematically and Rietveld wrote the computer program, the essential contributions of the first two are forgotten when using `Rietveld refinement'.

Ab initio structure determination and qu­antitative disorder analysis on nanoparticles by electron diffraction tomography

A routine to extract diffuse-scattering intensities caused by two-dimensional crystalline defects from tomographic electron diffraction data and an algorithm for comparison with simulated diffraction data were developed and applied to intergrown zeolite beta A and zeolite beta B.

Electron-density critical points analysis and catastrophe theory to forecast structure instability in periodic solids

Electron-density topology is used to detect instability in periodic solids.

Coordination numbers of the vertex graph of a Penrose tiling

A description of the coordination sequence of the vertex graph of a Penrose tiling is obtained.

Phasing via pure crystallographic least squares: an unexpected feature

Crystallographic least-squares techniques, a fundamental tool for crystal structure refinement, are used for the first time for ab initio crystal structure solution. No help was needed from other phasing techniques, such as the calculation of electron-density maps.

Development of a joint refinement model for the spin-resolved one-electron reduced density matrix using different data sets

A joint refinement model of the spin-resolved one-electron reduced density matrix is described and validated. The new model provides very satisfactory results.

Monoclinic sphere packings. II. Trivariant lattice complexes with mirror symmetry

All homogeneous sphere packings were derived that refer to the trivariant monoclinic lattice complexes with mirror symmetry.

The Physics of Solids

Introduction to Many-Body Physics

Geometry of Crystals, Polycrystals, and Phase Transformations