notes_14C_xray

notes_14C_xray - X-Ray Crystallography I. History: (Source:...

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X-Ray Crystallography I. History: (Source: Hardinger’s Lecture Supplement: X-ray Crystallography) 1895: Roentgen discovered x-rays 1912: von Laue, Friedrich, and Knipping passed x-rays through crystal of ZnS and concluded that: a) Crystals are composed of periodic arrays of atoms b) Crystals cause distinct x-ray diffraction patterns due to atoms 1914: Bragg and Lawrence showed that diffraction pattern can be used to determine relative positions of atoms within a single crystal (i.e., molecular structure) Rosalind Franklin: collected X-ray diffraction data on Na salt of DNA Guides Watson and Crick to determine that DNA is a double helix. II. X-ray Diffraction: (Atkins, Jones; Chemical Principle; 3 rd edition; pg 196-197) Used to determine the arrangement of atoms in a solid compounds and to measure bond lengths and structures. Diffraction: interference between scattered waves, which arises when there is an object in their path . Note: For diffraction to be observed, the wavelength of radiation must be
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notes_14C_xray - X-Ray Crystallography I. History: (Source:...

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