One-dimensional multiple scattering model for low-energy electron diffraction in the normal geometry

A one-dimensional multiple scattering model for low energy electron diffraction in the normal geometry is proposed. This model reduces to the regular or a modified kinematic approximation in the weak scattering limit. The one-dimensional multiple scattering model is applied to Xe(111), Ni(001) and Cu(001). The results with Xe(111) are very encouraging in that the calculated LEED spectral peak energies and intensities agree well with experiment. The Ni(001) and Cu(001) results are also encouraging. Although only half the peaks present in the experimental data are present in the Ni(001) and Cu(001) calculated spectra, those peaks present in the calculated spectra are in agreement with the experimental spectra. The authors hypothesize that these missing peaks can be explained by the alternating filled and vacant site structure of (001) planes in face centered cubic crystals.