w1-2_Key-Handout_1

w1-2_Key-Handout_1 - Key Terms and Concepts #1...

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Key Terms and Concepts #1 Crystallography A crystal is a periodic assembly of atoms arranged to fill space. Crystallography is the scientific tool used to describe and define crystal structures. Crystalline solids can be defined by their crystal structure and microstructure. Diffraction Crystals scatter waves of suitable sub-micron wavelengths radiation (e.g. X-rays) coherently, producing diffracted beams (DB). Diffracted beams are caused by constructive and destructive interference of the scattered wave amplitudes. The spatial intensity distribution of the diffracted beams is recorded in a diffraction pattern. A profound geometrical relationship between the diffraction pattern and the crystal structure.
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