Energieverluste von 50 keV-Elektronen an Ge und Si

Electron-Energy loss spectra of Ge and Si (amorphous, polycristalline and monocristalline) are measured in the low energy region of the band-band transitions and in the energy region of the plasma losses. These spectra are compared with the loss curve calculated from optical data: Discrepancies in the absolute values of the height and in the width of the plasma losses are found; the structures of the region of the bandband excitations show an agreement in the positions of the maxima, but not in their height. Additional electron energy loss maxima are observed.