High energy electrons scattering in solids
At high energies interpretation of electron scattering experiments becomes simple, and the data tells us a lot about the fundamental properties of solids. We study the electronic structure of thin films using electron-electron collisions in a coincidence technique called electron momentum spectroscopy. This is a coincidence technique that tells us the density of electrons with a certain binding energy-momentum combination. For an interacting electron gas this measurement can be compared directly to the spectral function. In addition we use electron-atom collisions to study the momentum distribution of nuclei in solids as well as the elemental composition of thin films. This experiment is just like Rutherford backscattering, but using electrons as the probing particles. Both experiments are unique in the world and rely on spectroscopy of electrons with energies of up to 50 keV with a resolution better than 1 eV.