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Surface Reconstruction: RHEED/LEED

  1. Oct 11, 2012 #1
    I'm having some trouble understanding surface reconstruction diffraction patterns. Please see Figure 2 on the third page of the attached document. An in-depth knowledge of the subject matter isn't needed, I just need someone more familiar with reconstruction and diffraction than myself. I need help understanding two things:

    1) In figure 2 (a) has the caption: "in addition to the 1x1 diffraction features, a weak 4x1 diffraction pattern consisting of three additional lines (marked by three arrows) within the 1x1 pattern is also visible." Why do three additional fractional visible lines indicate a 4x1 reconstruction pattern?

    2) In figure 2 (b), please explain how the LEED image indicates a two-domain (1x4)/(4x1) reconstruction. Is there a way to "outline" the domains? I'd like to be able to identify them from the picture.

    I'd really appreciate any insight anyone can give. I'm very new to this stuff.
     
  2. jcsd
  3. Oct 11, 2012 #2
    Files didn't get attached at first.
     

    Attached Files:

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