Electron diffraction intensities and structure analysis
نویسندگان
چکیده
منابع مشابه
Application of a 2-beam model for improving the structure factors from precession electron diffraction intensities.
A 2-beam model is used to simulate precession electron diffraction (PED) intensities. It is shown that this model can be inverted with minimal knowledge of the underlying crystal structure, permitting structure factor amplitudes to be deduced directly from measured intensities within the 2-beam approximation. This approach may be used in conjunction with direct methods to obtain correct, kinema...
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X-Ray powder diffraction (XRPD) has already successfully been used for a long time in the field of pharmaceuticals for polymorph screening (fingerprinting) and more recently for the structural and microstructural analysis of active pharmaceutical ingredients (API) and excipients.Large enough single crystals are in fact either very difficult to growth or do not represent well the properties of t...
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This guide sheet outlines a method for the analysis of cubic crystal forms, this being useful to you for interpreting the transmission diffraction pattern produced by scattering electrons off a thin film target of polycrystalline aluminium. The apparatus also contains samples with hexagonal structures. These are pyrolytic graphite targets, and are available both as single crystals and in polycr...
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A novel and general approach to scaling diffraction intensities is presented. The method minimizes the disagreement among multiple measurements of symmetry-related reflections using a stable refinement procedure. The scale factors are described by a flexible exponential function that allows different scaling corrections to be chosen and combined according to the needs of the experiment. The sca...
متن کاملStructure refinement from precession electron diffraction data.
Electron diffraction is a unique tool for analysing the crystal structures of very small crystals. In particular, precession electron diffraction has been shown to be a useful method for ab initio structure solution. In this work it is demonstrated that precession electron diffraction data can also be successfully used for structure refinement, if the dynamical theory of diffraction is used for...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2008
ISSN: 0108-7673
DOI: 10.1107/s0108767308099777