Notes for Authors

Investigation of the Angle Dependence of the Photon–Atom Anomalous Scattering Factors

The angle dependence of the anomalous scattering factors for elastic photon–atom scattering is expressed in terms of simple formulae and lookup tables.

Analytical Theory of Diffuse Scattering from Distributions of Non-overlapping Structures

The diffuse scattering for X-rays or neutrons is derived analytically in a closed form for nanoscale structures distributed according to any distribution function. Results for multilayers, phase separation, domain patterns, surface roughness and `hut' clusters are explicitly given.

An Algorithm for Solving Multiple-Wave Dynamical X-ray Diffraction Equations

An algoritm using the representation of the electric fields and wavevectors in a single Cartesian coordinate system with one of the axes perpendicular to the crystal surface is proposed to solve the fundamental equations of multiple-wave dynamical diffraction.

Bragg Reflection in Mosaic Crystals. I. General Solution of the Darwin Equations

The exact analytical solution of the Darwin equations is obtained for the first time for a crystal of finite thickness in the general case where the Bragg planes make an arbitrary angle with the surface of the crystal.

Bragg Reflection in Mosaic Crystals. II. Neutron Monochromator Properties

The analytical results obtained in the preceeding paper are used in a numerical calculation of the reflecting properties of a number of commonly used neutron monochromator crystals for both symmetric and asymmetric reflection geometries.

X-ray Diffraction from a Helix of Any Length that Displays Cumulative Azimuthal Disorder

An equation is derived to describe the diffraction broadening along the meridional direction by a helix of limited length that posesses cumulative azimuthal disorder. The applications of the theory to deoxygenated sickle-cell hemoglobin fibers and to F-actin fibers are discussed.

The Origin of Resonance Scattering in RHEED, Beyond the Tight-Binding Model

The results of an analytical and numerical study of reflection high-energy electron diffraction (RHEED) show the existence of a fundamental difference between resonance scattering of electrons and Bragg diffraction. It is found that the former is associated with peaks of the one-dimensional density of states (DOS), while the latter is related to forbidden gaps in the spectrum of the DOS.

On Integrating the Techniques of Direct Methods with Anomalous Dispersion. IV. A Simplified Perturbation Treatment for SAS Phasing

A treatment based on Friedel-pair two-phase invariants shows that single-wavelength anomalous-scattering (SAS) three-phase invariants tend to positive values and yields an origin-shifted tangent formula.

Side-Face Structure and Growth Mechanism of Tabular Silver Bromide Crystals

The side-face structure of tabular silver bromide crystals is experimentally determined and the preferential lateral growth is explained in terms of a substep mechanism induced by twin planes.

Checklist for the Description of Incommensurate Modulated Crystal Structures. Report of the International Union of Crystallography Commission on Aperiodic Crystals

The checklist for the publication of incommensurate structures has been proposed by the IUCr Commission on Aperiodic Crystals.

Comments on Crystal Properties via Group Theory by A. S. Nowick, Cambridge University Press, 1995

Nowick's book is criticized for its lack of reference to several important publications on group theory.

Structural electron crystallography by D. Dorset