Scattering factor oxidation state dependence

At energies above the edge, core electrons are excited to continuum states, and the spectrum becomes dominated by scattering phenomena, similarly as in EXAFS. Flence, in a qualitative sense, the shape of the XANES spectrum depends straightforwardly on the states that are available to the excited electron. These depend on several factors, such as the coordination of the atom (octahedral, tetrahedral, etc.), its mode of bonding, oxidation state, the density of states in the electron band, etc., which give XANES its great chemical sensitivity. 

---