Unelastische Streuung in der dynamischen Theorie der Elektronenbeugung

摘要: A general solution to the fundamental equations of inelastic scattering fast electrons in crystals is obtained by using a Green function constructed Bloch waves. Inelastic interband transitions are shown vanish if they direct type, but not when implying simultaneous Bragg reflexion. These selection rules hold for any type electron-crystal interaction. The resulting imaginary absorption potentials different intraband and can be calculated separately. They reduced simple form two-beam case. expression measuring anomalous contains Yoshioka potential C 0 i g an additional term which gives small contribution case crystal electron excitation no phonon excitation. Numerical calculations 100 keV Al, Cu, Ge, Si MgO made compared with experimental data. An analytic forYoshioka's due plasmon derived vanishes random phase approximation.