AC LEC 08-09

AC LEC 08-09 - Lecture 8 - X-ray Diffraction...

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Unformatted text preview: Lecture 8 - X-ray Diffraction Electromagnetic Waves Photons Amplitude and Phase X-ray Production Braggs Law Powder Diffraction Diffractometer Crystal Structure Determination Electromagnetic Spectrum Wavelength Frequency & Energy Wave Properties Amplitude Wavelength ( ) Frequency: F = c / c = 3 x 10 8 m/ s Wave Interferences In-Phase Addition Constructive Interference Out-of-Phase Addition Destructive Interference Diffraction : A change in the path of light or other wave motion, as sound, when passing near the edge of an obstacle, through slits, etc. Diffraction of Waves Why X-Ray Diffraction?? What are we trying to find? Structure at unit cell level Interplanar Spacing is ~0.5 to 0.05 nm For diffraction from array of atomic planes Need radiation with similar to above of medium energy X-rays ~0.1 to 0.05 nm VOILA! We may be able to use medium energy X-rays to study Xtal structure!! X-Ray Generation Step 1: Ionization Step 2: Hole filling Step 3: X-Ray emission Energy of X-Ray Photon E X = E K E L3 X-ray Tube Schematic Diagram Origin of K and K...
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AC LEC 08-09 - Lecture 8 - X-ray Diffraction...

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