Thermal Diffuse Scattering of Low-Energy Electrons from Xe
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abstract
One-phonon thermal-diffuse-scattering intensities have been calculated for the (111), (100), and (110) surfaces of Xe. The calculations are based on the (pseudo-) kinematical approximation, which is presumably very good for this material. The finite penetration of the electrons into the crystal is approximately taken into account with a transmission factor. As we have pointed out previously, it is important to include the penetration since the assumption of scattering from the surface layer only (made in treatments by other authors) leads to results which are qualitatively incorrect. The present calculations are for extensive regions of reciprocal space including several reciprocal lattice rods. The results are presented in the form of both contour curves and intensity profiles. Several interesting features are apparent, including (i) anisotropies about the reciprocal lattice rods, (ii) differences in intensity distributions around different rods which are caused by interference effects (and which therefore provide a measure of the attenuation of the electron beam), and (iii) the presence of an "extra spot" in the results for the (100) surface. It is possible that these qualitative features can be observed in low-energy electron diffraction experiments on other monatomic fcc materials. 1973 The American Physical Society.
