1/25/2024 0 Comments Asu advanced lab xray diffraction![]() ![]() Lecture 4 expands from symmetry of discrete objects to those of infinitely repeating patterns that fill space. Then point symmetry elements - the symmetry that can be found in discrete objects - are introduced. Lecture 3 relates the unit cell to the concept of the lattice and introduces the 14 Bravais lattice types. Lectures 3 & 4: Symmetry and Point Groups The sharp facets of crystals are determined by the underlying symmetry of the unit cell these facets are described by Miller indices. ![]() This lecture discusses what is a crystal, defines the concept of a unit cell and defines the seven classes of unit cells. Presentation (see original versions for slides) (Note that refractive optics for x-rays are used at the APS, in contrast to what is mentioned in the lecture). This lecture introduces crystallography, including the history and generation of x-rays. Bernhardt Wuensch in 2005 ( 41 video lectures) Lecture notes are in PDF format and have been updated since the time these lectures were recorded (original versions are here).Īlso of possible interest is MIT Open Course 3.60 (Symmetry, Structure, and Tensor Properties of Materials) taught by Prof. Lind and the University of Toledo Department of Chemistry for permission to post these videos and notes. The preparation of these lectures was in part supported by National Science Foundation CAREER award DMR-0545517. Cora Lind-Kovacs for her Chem 4980/6850/8850: X-ray Crystallography course at the University of Toledo (Ohio). This web page contains 15 lectures and handout notes given by Dr. ![]()
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