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Zusammenfassung:
Surface electron energy loss fine structure experiments above the N2,3 edge of polycrystalline Pd have been performed in order to study the applicability of the dipole approximation and the plane-wave-approximation for this system. Strong quadrupole contributions have been determined, which cannot be neglected. Furthermore, the curved-wave approximation rather than the plane-wave approximation has to be used for the calculations of the backscattering phase shifts and the backscattering amplitudes. The use of the plane-wave approximation leads to wrong next-nearest-neighbour distances.
