Dynamical theories of RHEED

Reflection high-energy electron diffraction is a Bragg case, in which the beams to be detected are those reflected from the bulk crystal surface. Owing to the strong interaction between the incident electron and the crystal atoms, multiple (or dynamical) scattering is very strong. Although the positions of RHEED beams can generally be predicted by kinematical scattering theory, quantitative analysis of RHEED patterns relies on dynamical calculations. In this chapter, we will first illustrate the quantum mechanical approach for electron diffraction. Then we will outline a few commonly used dynamical theories accompanied by some calculated results.