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How's diffraction pattern modied by phonon perturbation?

  1. Feb 13, 2015 #1
    Hi there,
    I have a problem on phonon perturbation's effect on diffraction pattern.

    Assume atomic planes parallel to (100) of bcc lattice is periodically perturbed by phonon.

    How will diffraction pattern be modified as a result of such perturbation? Will we see any diffraction peaks in addition to those seen for a unperturbed lattice?

    Thanks!
    Capture.PNG
     
  2. jcsd
  3. Feb 14, 2015 #2
    You get a reduction in the amplitude of the normal diffraction peaks, usually described by a Debye-Waller factor, and in addition you get Thermal Diffuse Scattering.

    http://en.wikipedia.org/wiki/Debye–Waller_factor

    http://www.neutron.ethz.ch/education/Lectures/neutronfall/Lecture_4-2 [Broken]
     
    Last edited by a moderator: May 7, 2017
  4. Feb 15, 2015 #3
    Thank you! It's really helpful.
     
    Last edited by a moderator: May 7, 2017
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