Lecture12-LaueBackscatteringII

Lecture12-LaueBackscatteringII - EMSE 312 Diffraction...

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Unformatted text preview: EMSE 312 Diffraction Principles Lecture 12 Laue Backscattering Techniques and Stereographic Projections (cont.) EMSE 312 DIFFRACTION PRINCIPLES EMSE 312 Diffraction Principles Laue Backscattering Technique Each plane will diffract for Know the point of the diffracted beam Want to know the point for the plane normal ( ) B hkl 2d sin n = Single Crystal n Diffracted Beam Plane Normal Plane d hkl Incident Beam Photographic Plate B B O B 2 2 1 8 + = = EMSE 312 Diffraction Principles Braggs Law Real Space vs. Reciprocal Space Considerations ( ) B hkl 2d sin n = Real Space Reciprocal Space Wave Vector - k k k hkl d 1 1 2 2 B B B B ( ) B hkl d s i n ( ) B hkl d s i n n g B B k g k ' + = G G G EMSE 312 Diffraction Principles b* c* Allow an x-ray beam interact with a single crystal Laue Backscattering Technique 000 010 001 Probability of Interaction MAX MIN 1 k = G MAX MIN 1 k = G MIN MAX 1 k = G MIN k G MAX k G ( ) 045 MIN ( ) 045 MAX EMSE 312 Diffraction Principles Laue Backscattering Technique E x a m p l e SWL 0.0355nm = Accelerating Voltage LWL 0.2nm = Absorption in Air ( ) 110 ( ) 410 ( ) 130 Explore EMSE 312 Diffraction Principles...
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Lecture12-LaueBackscatteringII - EMSE 312 Diffraction...

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