hereby m depends the atomic number Z of the medium and decreases with increasing photon energy hn [1]. However, the fine structure of this element-specific edge of the absorption coefficient is influenced by the energy of unoccupied electronic levels, as it is depicted in Fig. 1(a). Only a sufficient photon energy enables the photoexcitation of a core level electron beyond the vacuum level Evac. After 10×10-14 sec [2] the ionized atom may relax by occupation of the core hole with an electron from the valence band (VB), while the generated energy will normally not be used for the emission of a flourescence photon (probability 1 %), but will be absorbed for the vaccum emission of an Auger electron (probability 99%) from the valence band. In case of a non-sufficient energy for the emission of the primary electron, it may be excited into a conduction band (CB) level, so that a similar relaxation process becomes possible. This spectator process then results in the emission of only one Auger electron.