THE EXPERIMENTAL CONDITIONS FOR COMPTON-SCATTERING IN THE ELECTRON-MICROSCOPE

Electron Compton scattering from solids (ECOSS) is a technique for obt aining the momentum density distribution of charge carriers in a solid on a scale of mum or less. We discuss the possibilities and the probl ems of this experimental technique, which uses a conventional transmis sion election microscope (CTEM) equipped with a parallel electron ener gy-loss spectrometer (PEELS). Favourable experimental conditions are p roposed, including a scattering geometry that minimizes contributions from Bragg scattering. The procedures leading from raw spectra to Comp ton profiles that can be compared with theoretical predictions are des cribed, with emphasis on background handling and deconvolution. It is shown that experiments agree well with theory. An ultimate momentum re solution of 0.05 atomic units appears feasible.