Dynamical Theory of Electron Diffraction for a Finite Polyhedral Crystal II. Fraunhofer Formula

Abstract

The general formula derived in the previous paper has been simplified by introducing an assumption that the wave-length of electrons compared with crystal size is very short. The simplified formula is more practical and directly applicable to the interpretation of the simple- and double-refraction as well as the Fraunhofer diffraction effects of Laue spot. A comparison of the dynamical and corresponding Kinematical formulae shows that the concept of “Intensitätsbereich” as advocated by von Laue in his kinematical theory may be used in dynamical theory. Finally some numerical examples and comparison with theory and experiment are given.