XRay (LS) - X-ray Crystallography Fundamental Concepts...

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Lecture Supplement: X-ray Crystallography 43 X-ray Crystallography Fundamental Concepts X-rays are diffracted by electrons Diffraction: constructive or destructive interference of scattered waves Pattern of diffracted x-rays useful to obtain orientation of atoms in space (molecular structure) History 1895: discovered by William Röentgen; called x-rays 1912: von Laue, Friedrich, and Knipping: "Interference Effects with Röentgen Rays" Experiment: passed x-rays through crystal of sphalerite (zinc sulfide); distinct diffraction pattern observed Conclusions: (a) Crystals cause distinct x-ray diffraction patterns due to atoms. (b) Crystals are composed of periodic arrays of atoms. 1914: English physicists Sir William Henry Bragg and his son Sir William Lawrence Bragg showed that the scattering of x-rays could be represented as a "reflection" by successive planes of atoms within a crystal Implication: diffraction pattern can be used to determine relative positions of atoms within a single crystal (i.e., molecular structure)
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This note was uploaded on 03/09/2010 for the course CHEM 30B Chem 30B U taught by Professor Miguelgarciagaribay during the Summer '10 term at UCLA.

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XRay (LS) - X-ray Crystallography Fundamental Concepts...

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