Real-space Green's-function approach within RHEED

Green's-function techniques are used to obtain a real-space series solution for the elastic reflection high-energy electron diffraction (RHEED) from a crystalline surface. A renormalized perturbation expansion due to potentia l self-scattering is developed for the local real-space Green's function. W ith the Pt (111) surface as an example, numerical results are obtained for reflection coefficients and intensities. In particular, calculations are pe rformed to obtain the local density of states at and near the surface regio n. Total density-of-states calculations are also performed. These provide a basis for a discussion of the form of resonant electronic Green's function s that can be used to describe the surface resonance phenomenon within RHEE D.