X-ray absorption study of the electronic structure of tungsten and molybdenum oxides on the O K-edge

摘要

Magnetron sputtered amorphous thin films a -WO_3,a-MoO_3 and doped a Wo_3:Ir have been studied by X-ray absorption spectroscop on the oxygen K-edge in comparison with crystalline oxides as monoclinic m-WO-3,orthorhomibic #alpha#-MoO_3,Cubic Na_(0.6)WO_3layered-type hexagonal h-WO-3 and WO_3centre dot H_2O ,Having variableelectronic and atomic structureThe changes in the XANES ranging 10-15eV above the absorptionedge are interpreted based on the knownband-structure calculateions.The high-energy features are related to themultiple-scattering processes (EXAFS) at the nearest atoms.