A TREATMENT OF RHEED FROM A ROUGH-SURFACE OF A CRYSTAL BY AN OPTICAL-POTENTIAL METHOD

The general formalism of the optical potential method has been applied to the problem Of reflection high energy electron diffraction (RHEED) from the rough surface of a crystal. For the case where short-range disorder dominates an explicit analytical expression for the effective absorption potential has been obtained, and procedures for evaluating this potential have been developed which utilize the conventional approaches and computer routines developed earlier for transmission high energy electron diffraction (THEED). This potential has been combined with dynamical RHEED calculations for a molecular beam epitaxy (MBE) growing surface. It is found that under certain circumstances the optical potential due to the roughness of the MBE growing surface has an appreciable effect on the shape of the corresponding RHEED rocking curve.