Abstract
The incident beam effects in the Auger Electron Diffraction of the Cu(001) surface have been studied through the anisotropy emission of the L 2,3VV and the M 2,3VV transitions. The spectra have been collected using a screened CMA in a polar scan for the two main direction [100], [110] and in normal emission azimuthal scan. The low and high kinetic energy Auger lines show anisotropies spectra with very different behaviour all over the polar angle scan, in particular around the 0° emission we observe that the anisotropy signal is in total antiphase. This is in very good agreement with the theoretical and the experimental X-ray photoelectron diffraction. Although incident beam diffraction should be sizeable, when the collection of the spectra is made with a standard CMA, our experiments evidence that incident beam diffraction plays a negligible role when the electrons collection is made through a very small detection angle.
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