Bragg reflection at the BZ

  1. Feb 13, 2013 #1
    As far as I know, Bragg diffraction happens for incident particles which are free; for example free electrons or X-ray are Bragg-reflected under the special conditions. Why the Bragg diffraction happens for electrons which are not free in a crystal?
     
  2. jcsd
  3. Feb 13, 2013 #2

    M@2

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    Bragg diffraction happens for WAVES.
    Waves can be of any nature and spread in any medium. Electron wave in ion's lattice is a WAVE with ions as diffracting screen.
     
  4. Feb 13, 2013 #3
    If we consider the diffraction classically, incident waves are in direction of [itex]k[/itex] and reflected waves are in direction of [itex]k^\prime[/itex] and [itex]G=k-k^\prime[/itex]. But for electrons in crystals direction of motion is not direction of wave vector.
     
    Last edited: Feb 13, 2013
  5. Feb 13, 2013 #4

    M@2

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    In classical physics electrons are not WAVES, so you could not bragg diffract electrons.
     
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