electrondiffraction

electrondiffraction - ED-1Electrlectrlectrlectrlectron...

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Unformatted text preview: ED-1Electrlectrlectrlectrlectron Difon Difon Difon Difon DiffrfrfrfrfractionactionactionactionactionGoalGoalGoalGoalGoalTo gain an understanding of the wave behavior of electrons.IntroductionIntroductionIntroductionIntroductionIntroductionIn quantum mechanics, we create models using waves. But why do we have to do so?Why cant we just use Newtonian mechanics to study topics in quantum mechanics?Actually, researchers started with this classical approach and found that it did not work.They found that when things become extremely small, many physical features can nolonger be precisely determined and thus need to be studied with probabilities and waves.In this tutorial, we will explore the wave and particle features of matter. Using electronsas the example, we will do experiments looking for evidence that supports our modelthat an electron can be a wave as well as a particle. If you can prove this model wrong,please do so!A. DifA. DifA. DifA. DifA. Diffraction of Photonsfraction of Photonsfraction of Photonsfraction of Photonsfraction of PhotonsSuppose a parallel beam of light with wavelength is incident on two slits where theseparation distance between the slits is d. The width of the light beam, h, is much greaterthan d. A screen is placed beyond the slits at a distance L. The center of the screen andthe mid-point between the slits are set at x = 0.Figure 1. Diagram of the double-slit experimentVisual Quantum MechanicsVisual Quantum MechanicsVisual Quantum MechanicsVisual Quantum MechanicsVisual Quantum MechanicsThe Next GenerationThe Next GenerationThe Next GenerationThe Next GenerationThe Next Generation@20@20@20@20@2000, Ph0, Ph0, Ph0, Ph0, Physics Education Rysics Education Rysics Education Rysics Education Rysics Education Researcesearcesearcesearcesearch Group, Kh Group, Kh Group, Kh Group, Kh Group, Kansas State Uniansas State Uniansas State Uniansas State Uniansas State Uniververververversitysitysitysitysity. . . . . Visual Quantumisual Quantumisual Quantumisual Quantumisual QuantumMecMecMecMecMechanics is supporhanics is supporhanics is supporhanics is supporhanics is supported by the National Sted by the National Sted by the National Sted by the National Sted by the National Science Fcience Fcience Fcience Fcience Foundation under grant DUE 965288.cience Foundation under grant DUE 965288....
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This note was uploaded on 02/12/2010 for the course CHEM 20A taught by Professor Scerri during the Fall '05 term at UCLA.

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electrondiffraction - ED-1Electrlectrlectrlectrlectron...

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