Abstract
We report on the measurement of the three-dimensional electronmomentum density (EMD) of solids by means of the (γ, eγ)reaction. Fixing the reaction kinematics by a coincidencecondition, the triple-differential cross section for Comptonscattering is proportional to the EMD. The experiments wereperformed either at the wiggler beamline of the European SynchrotronRadiation Facility (ESRF) or the undulator beamline of the PETRAstorage ring at Deutsches Elektronen-Synchrotron (DESY) with photonenergies of about 150 keV. Experimental three-dimensional EMDs ofgraphite, fullerene and aluminium are compared with theoretical onesobtained from band-structure calculations like the full-potentiallinear muffin-tin orbital, augmented-plane-wave and pseudopotentialformulations. In addition, the change of the EMD caused by alloyformation has been studied in the Cu-Ni system and the results arecompared with the Korringa-Kohn-Rostoker coherent potentialapproximation.
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