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Cover illustration: A structural model of the decagonal Al-Pd-Mn quasicrystal, which consists of clusters represented by decagons and ten pentagons surrounding each decagon. This is obtained from a periodic structure in five-dimensional space by taking a three-dimensional section. Courtesy of A. Yamamoto. |
Acta Cryst. (1997). A53, 1-6 [doi:10.1107/S0108767397099996]
Acta Cryst. (1997). A53, 7-14 [doi:10.1107/S0108767396009609]
Synopsis: The angle dependence of the anomalous scattering factors for elastic photon-atom scattering is expressed in terms of simple formulae and lookup tables.
Acta Cryst. (1997). A53, 15-27 [doi:10.1107/S0108767396007180]
Synopsis: 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.
Acta Cryst. (1997). A53, 28-34 [doi:10.1107/S0108767396009713]
Synopsis: 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.
Acta Cryst. (1997). A53, 35-45 [doi:10.1107/S0108767396009804]
Synopsis: 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.
Acta Cryst. (1997). A53, 46-54 [doi:10.1107/S0108767397099984]
Synopsis: 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.
Acta Cryst. (1997). A53, 55-62 [doi:10.1107/S0108767396011300]
Synopsis: 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.
Acta Cryst. (1997). A53, 63-73 [doi:10.1107/S0108767396011312]
Synopsis: 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.
Acta Cryst. (1997). A53, 74-83 [doi:10.1107/S0108767396011993]
Synopsis: 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.
Acta Cryst. (1997). A53, 84-94 [doi:10.1107/S010876739601238X]
Synopsis: 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.
Acta Cryst. (1997). A53, 95-100 [doi:10.1107/S0108767396010185]
Synopsis: The checklist for the publication of incommensurate structures has been proposed by the IUCr Commission on Aperiodic Crystals.
Acta Cryst. (1997). A53, 101 [doi:10.1107/S0108767396005715]
Acta Cryst. (1997). A53, 102 [doi:10.1107/S0108767396008446]
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