RHEED and Disordered Surfaces
The diffraction patterns of reflected high energy electrons (RHEED) from perfect crystals having ideal flat surfaces are expected to consist of sharp spots lying on a Laue circle. Such patterns have indeed been observed, for instance on Si and Ge surfaces. This is a consequence of momentum conservation parallel to the surface, including the possibility of transferring a reciprocal lattice vector, together with energy conservation. The directions of the diffracted beams are then given by the intersection of the infinitely thin reciprocal lattice rods perpendicular to the surface and the Ewald sphere.
KeywordsDiffuse Scattering Reciprocal Lattice Vector Molecular Beam Epitaxy Growth RHEED Pattern Diffraction Process
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