phys3313-lec8 - Physics 3313 - Lecture 8 9/21/2009 1 3313...

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Unformatted text preview: Physics 3313 - Lecture 8 9/21/2009 1 3313 Andrew Brandt Monday September 21, 2009 Dr. Andrew Brandt 1. HW 3 due Weds 23 rd 2. Diffraction 3. Particle in a Box 4. Uncertainty Principal and Examples 5. The Electron 6. Rutherford Scattering Diffraction: Davisson and Germer Davisson and Germer in U.S. and Thomson in UK confirmed de Broglie hypothesis in 1927 by demonstrating diffraction (wave phenomena) of electron beams off crystal Classically electrons scattered in all directions with minor dependence on intensity and energy Initial results for scattering off block of nickel favored classical interpretation! Then accident allowed air in to setup which oxidized the surface of the nickel block, so they baked (heated) it to get rid of impurities Suddenly results differed: distinct maxima and minima with position dependent on incident electron energy 9/16/2009 3313 Andrew Brandt 2 How can the results be explained and why did the change occur? Heating causes nickel to form a single large crystal instead of many small ones Electron waves diffracted off single crystal Bragg equation for diffractive maxima: d=0.091 from x-ray diffraction measurement angle of incidence and scattering relative to Bragg planes (families of parallel planes in crystalsee Sec. 2.6) for n=1 maxima Obtain...
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phys3313-lec8 - Physics 3313 - Lecture 8 9/21/2009 1 3313...

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