Youtor
Introduction to Xray Diffraction
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=ui7DbjQ4oKc
0:00 how did scientists originally determine crystal structure? • 2:11 discovery of X-rays by Wilhelm Rontgen • 3:51 double slit experiment for constructive and destructive interference • 9:02 William Bragg discovers X-ray diffraction • 10:24 illustration of planes of atoms and their interplanar spacing. • 14:58 constructive vs destructive interference • 16:23 Constructive interference as a tool for measuring interplanar spacing • 20:13 Bragg's Law • 21:23 calculating interplanar spacing, d • 24:22 example of calculating interplanar spacing • 30:51 why certain (hkl) peaks cause XRD reflections but others do not even though they satisfy Bragg's law • 33:56 example of calculating allowed/disallowed (hkl) reflections and determining their 2 theta position • 49:01 Measuring X-ray diffraction and using XRD patterns to identify crystal structure using matching software
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