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Homework Help: Diffraction orders of grazing incidence

  1. Apr 29, 2015 #1
    1. The problem statement, all variables and given/known data
    We have a honeycomb lattice. There is an incident wave of 400 nm, whose wavevector has an angle of 75 degree with the surface's normal. This problem is similar to LEEDS ( low energy electron diffraction).

    2. Relevant equations
    What is the condition of diffraction i.e. which orders achieve Von-Laue conditions ?

    3. The attempt at a solution
    I tried to put that |G_2d|<=2*|k_s|, where G is the 2-dimension reciprocal lattice vector, and k is the length of the scattering wavevector ( |K_incidence|=|K_scattering|).
  2. jcsd
  3. May 1, 2015 #2
    hmm that's interesting, did you take in to account the lattice surface structural constant into account?
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