Investigation of the electronic structure of CuO by means of resonant X-ray Raman scattering

excited state. By means of a perturbation theoretical treatment of the Coulomb interaction between the core-hole and the 3d-electrons an expression for the cross-section of the shakeup-process is derived. Thereby the observed excitation energy dependence of the shakeup-satellite's intensity and its position in the energy loss spectrum can be explained. Furthermore, its intensity shows a strong dependence on the scattering angle in certain scattering geometries. By means of a model calculation this dependence is attributed to a polarisation-effect. In this thesis the electronic structure of CuO is investigated utilizing resonant X-ray Raman Scattering. The special properties of this transition metal oxide are emphasized and the potential of the method is shown. First it is explained how one can draw conclusions about the unoccupied density of states of CuO and its symmetry from measurements of the copper K-alpha fluorescence by using an excitation energy of a few eV below the absorption threshold. By this means one can make use of the fact that different intermediate states of the resonant scattering process can be separated by the so-called Raman-shift. Moreover, the magnitude of the contributions of intermediate states of different symmetry to the fluorescence spectrum strongly depend on the polarisation of the incident x-ray beam. Thereby, three features in the measured spectra can be identified and can be attributed to different intermediate states. Another aspect of this thesis is the study of the interaction between the 1s core-hole in the intermediate state of the scattering process and the localized 3d-electrons of copper in CuO. At excitation energies of a few eV above the absorption threshold of the copper K-edge this interaction leads to the so-called shakeup-satellites in the energy loss spectra. In the special case of CuO such a satellite shows up at an energy loss of about 5 eV. This satellite is attributed to an excitation from the binding ground state of the 3d-electron system to an antibindin