SEMI-DYNAMICAL RFS TECHNIQUE FOR LEED ANALYSIS, WITH AN APPLICATION TO GAAS(110)

Realistic dynamical calculations using Pendry's renormalized forward scattering (RFS) scheme are almost impossible to perform at energies E APP GRTH 100 eV for the structure of GaAs(110) reported by Kahn et al. , which includes subsurface atomic displacements, because of the time needed to compute layer reflection and transmission matrices. The technique presented is based on the RFS scheme, using kinematically computed layer matrices, which reduces computation times by almost two orders of magnitude. Curves computed thus are in good agreement with dynamically computed curves over an energy interval where the latter calculation is feasible. The kinematical RFS curves are also compared with experimental data taken at normal and off-normal angles of incidence.