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The BCA/CCG (Chemical Crystallography Group of the British Crystallographic Association) Intensive Teaching School in X-Ray Structure Analysis is intended primarily for younger scientists with some experience of structure analysis who wish to improve their understanding of the underlying principles and practice. The work schedule is intensive, with lectures starting at 17:30 on Saturday 29^th March 2025 and the last lecture scheduled to finish on Saturday 5^sth April 2025. The school provides a good mixture of lectures and tutorials sessions with a friendly atmosphere. Participants must have a very good understanding of spoken English since there is a lot of material to be covered in rather a short time.

The main focus of the school is on the background theory for single crystal X-ray diffraction as applied to chemical and materials science. Topics to be covered will include:

• Growth and evaluation of non-macromolecular crystals
• Space group determination
• Background theory to data acquisition for small molecules and inorganics
• Practical aspects of data collection
• Practical aspects of data processing
• Fourier syntheses
• Patterson syntheses and direct methods for crystal structure determination
• Charge flipping
• Refinement of inorganic, organic and metal-organic structures
• Derivation of results
• Random and systematic errors
• Twinning
• Validation of results
• Crystallographic databases (CSD, ICSD, etc)