The birth of the European Crystallographic Committee (ECC) and of the European Crystallographic Meetings (ECMs)

This article describes the circumstances of the establishment of the European Crystallographic Committee, now the European Crystallographic Association, a regional associate of the IUCr, and of the European Crystallographic Meetings.

Dense quasicrystalline tilings by squares and equilateral triangles

A new method of generating quasicrystalline patterns with 12-fold symmetry from tilings by squares and equilateral triangles is described.

Effect of convergent beam semiangle on image intensity in HAADF STEM images

It is found that the intensities of bright spots in a spherical aberration (C_s)-uncorrected high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) image of [011]-oriented Co₃O₄ change with sample thickness. From an analysis based on the Bloch-wave theorem, it is found that an insufficient semiangle of the incident convergent beam leads to intensities that do not depend on the average atomic number in the atomic columns.

A neutron interferometric measurement of a phase shift induced by Laue transmission

The phase shift of the transmitted neutron beam in Laue geometry is investigated by neutron interferometry.

The long-wavelength limit of the structure factor of amorphous silicon and vitreous silica

The structure factors for amorphous silicon and vitreous silica are determined in the long-wavelength limit from large computer models and compared with available experiments.

Reconstruction from a single diffraction pattern of azimuthally projected electron density of molecules aligned parallel to a single axis

The azimuthally projected electron density of an isolated molecule of high degree of rotational symmetry about an alignment axis may be reconstructed by an iterative phasing algorithm applied to the diffuse diffraction pattern from an ensemble and beam incidence normal to the molecular alignment axis.

Molecular crystal global phase diagrams. II. Reference lattices

Experimental crystal structures that are amenable for inclusion in global phase diagrams as previously developed are identified.

Molecular crystal global phase diagrams. III. Sufficient parameter space determination

A small number of parameters describe a rich variety of phases in tetrahedral molecular crystals found in the Cambridge Structural Database.

A new approach to calculating powder diffraction patterns based on the Debye scattering equation

A method is described for the calculation of X-ray or neutron diffraction patterns of conventional crystalline powders based on the Debye scattering equation. Full background and reflection profiles are generated, whereby the effects of crystallite size and static and thermal disorder are also taken into account.

X-ray constrained unrestricted Hartree–Fock and Douglas–Kroll–Hess wavefunctions

The X-ray constrained unrestricted Hartree–Fock approach at the Douglas–Kroll–Hess and the nonrelativistic level of theory is presented. The relativistic and X-ray constraint effects in structural data, electron and spin density are reported.

Low-angle scattering by cylindrical structures

Scattering at small angles for cylindrical tubules has been theoretically studied. From the intensities at second angles of scattering, physical and chemical parameters of the tubules can be determined.

Report of the Executive Committee for 2008

Nominations for the Ewald Prize

Notes for authors 2010