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Real-space multiple-scattering analysis of X-ray absorption near-edge K spectra of Cu2O and CuO

X-ray absorption near-edge structure of Cu K spectra of Cu2O and CuO are analysed within the real-space multiple-scattering formalism. The crudest approximation (both in the cluster size and in the order of scattering) which can be made so that a particular spectral feature is still satisfactorily reproduced is found for each of the peaks. It was demonstrated that the peaks which correspond to one another both in the energy position and in the magnitude need not arise through the same scattering mechanism. Hence, caution must be exercised when the spectra of different compounds are compared. Multiple scattering involving non-collinear atoms can be important even in materials with inversion symmetry at approximately 20 eV above the edge.