THE ELECTRON MOMENTUM DENSITY OF COPPER STUDIED BY (GAMMA, E-GAMMA) SPECTROSCOPY

We report coincidence measurements between inelastically scattered 148 keV photons and the recoil electrons generated within a 80 nm thin Cu foil. We have analysed the Doppler broadening of the scattered photon intensity. which corresponds to a scan through the three-dimensional electron momentum density (EMD) parallel to the momentum transfer vector. The experimental data are compared with a theoretical EMD from the modified augmented plane wave method. A Monte Carlo calculation is described that allows for the correction of multiple electron scattering within the foil. Estimates of the triple-differential cross section for Compton scattering are given. The experiment was performed with the synchrotron radiation from a bending magnet of the DORIS storage ring at Deutsches Elektronen-Synchrotron (DESY), Hamburg, Federal Republic of Germany.