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3: X-rays

Last updated

Jun 30, 2023
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- 2.1: Lepton
- 3.1: Absorption edge

Online Dictionary of Crystallography
International Union of Crystallography

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Topic hierarchy

3.1: Absorption edge
3.2: Anomalous absorption
3.3: Anomalous dispersion
3.4: Anomalous scattering
3.5: Borrmann Effect
Due to anomalous absorption, type 1 wavefields propagate in a perfect or nearly perfect crystal with a less than normal absorption. For details and the physical interpretation, see anomalous absorption.
3.6: Bragg's law
Bragg's law provides the condition for a plane wave to be diffracted by a family of lattice planes.
3.7: Bragg angle
3.8: Cromer–Mann coefficients
3.9: Dynamical diffraction
3.10: Dynamical theory of Scattering
3.11: Electron density map
3.12: Ewald sphere
3.13: F(000)
3.14: Friedel's Law
Friedel's law states that the intensities of the $h$, $k$, $l$ and $\overline{h}$, $\overline{k}$, $\overline{l}$ reflections are equal. This is true either if the crystal is centrosymmetric or if no resonant scattering is present. It is in that case not possible to tell by diffraction whether an inversion center is present or not. The apparent symmetry of the crystal is then one of the eleven Laue classes.
3.15: Friedel pair
3.16: Integral reflection conditions
3.17: Kinematical theory
3.18: Laue equations
The three Laue equations give the conditions to be satisfied by an incident wave to be diffracted by a crystal.
3.19: Lorentz–polarization correction
3.20: Mosaic crystal
The mosaic crystal is a simplified model of real crystals proposed by C. G. Darwin. In this model, a real crystal is described as a mosaic of crystalline blocks tilted to each other by fractions of a minute of arc. Each block is separated from the surrounding blocks by faults and cracks.
3.21: Primary extinction
3.22: Reflection conditions
3.23: Resolution
3.24: Resonant scattering
3.25: Secondary extinction
3.26: Serial reflection conditions
3.27: Structure Factor
The structure factor is a mathematical function describing the amplitude and phase of a wave diffracted from crystal lattice planes characterized by Miller indices h,k,l.
3.28: Systematic absences
3.29: Zonal reflection conditions

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