X-Ray Diffraction Techniques
Videos 4.1-4.4 present some important special cases of X-ray scattering: protein crystallography, powder diffraction, and diffraction from smectic or polymer lamellar or columnar phases. These videos are independently accessible without viewing those in previous sections.
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4.1 - Protein Crystallography
Paul A. Heiney
Review of crystallography. Role of crystallography in modern biology. Outline of steps and process in protein crystallography as an important special case of single-crystal crystallography. Time 7:03.
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4.2 - Powder Diffraction
Paul A. Heiney
Challenges and advantages of measuring samples that consist of many microscopic domains. Steps in a powder diffraction measurement. Example of a classic measurement in alkali-doped C60. Time 7:20.
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4.3 - Smectic Liquid Crystals and Lamellar Polymers
Paul A. Heiney
General features of layered soft materials such as smectic liquid crystals and lamellar polymers. Identification of lamellar phases. What you can learn from peak intensities. Time 4:53.
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4.4 - Hexagonal Columnar Arrays
Paul A. Heiney
Scattering from columnar liquid crystals and hexagonal copolymers. Hexagonal lattice and reciprocal lattice. Dendritic liquid crystals. Example of electron density reconstruction using Bessel functions. Time 5:24.