Basics of Crystallography

• Bragg's Law and Scattering
• Anomalous scattering
• Friedel's law
• Symmetry and space groups
• Special positions
• Centric and acentric reflections
• Intensity statistics
• Choice of origin
• Ways to index a diffraction pattern
• non-crystallographic symmetry

See also

Definitions and explanations in the IUCr Online Dictionary