Bragg spot

Fig. 4. UED of condensed phases — crystals and solid-to-liquid phase transitions. Shown are the diffraction from the crystal (top) diffraction image referencing of Bragg spots (middle) and of amorphous-to-liquid transition (bottom).

Experimentally the PD may be studied by diffuse X-ray scattering (DXS) experiments in which the ID distortion of the chains gives rise to weak continuous lines on either side of the layer lines of strong Bragg spots.10 The periodicity of the PD may be determined from the position of the diffuse line. In contrast, 3D superstructures give rise to real satellite reflections associated with the Bragg spots. 

Figure 3. (A) Real and (B) reciprocal space representations of a single crystal with three Bragg planes noted in (A) and their corresponding Bragg conditions shown in (B). Note that the momentum transfer for each Bragg peak in (B) has an orientation that is perpendicular to the Bragg planes noted in (A). A schematic powder diffraction pattern of the structure shown in (A) is shown in (C) with each reflection identified. A reciprocal space description of a powdered sample is shown in (D), in which each Bragg spot is broadened into Bragg rings.

Figure 8.6 Interpretation of the hexagonal pattern observed in the H2 range of SijsCjEs, 6/D4 morphologies, (a) Observed 2D SAXS pattern for = 0 5 (inner structure contrast manipulated to show higher order Bragg spots as well) (b) scheme of possible honeycomb layer cross...

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