COMMENTS ON THE CORRECTION OF HOLOGRAPHIC IMAGES FROM FORWARD-SCATTERING DIFFRACTION PATTERNS

Real-space images along the nearest-neighbour directions are calculated from measured photoelectron diffraction maps of Cu(001) using Huygen's theorem. The images are corrected for the phase shifts and anisotropies of the electron scattering using the method of the scattered-wave-included Fourier transform (SWIFT). Measurements taken at 7 different kinetic energies (768-1740 eV) allow us to distinguish symmetry and interference effects. It is shown that for photoemission from substrates even the corrected images are dominated by symmetry and little indication of atomic positions is found.