Convergent-beam RHEED calculations of a 'forbidden reflection' from the Si (111) surface

Results of convergent-beam reflection high-energy electron diffraction (CB-RHEED) calculations are presented for the (111) surface of silicon. These double rocking calculations are performed using a dynamical scattering approach. This is based on evaluation of the surface parallel multislice matrix for reflection with account taken of the boundary conditions. In particular, calculations are shown for intensities close to a reflection that is kinematically forbidden. Particular note is made of the computational simulation of intensity enhancements corresponding to surface wave resonance conditions.