FULL MULTIPLE-SCATTERING CALCULATIONS ON SILICATES AND OXIDES AT AL K-EDGE

We present Full Multiple Scattering calculations at aluminium K-edge t hat we compare to experiments for four crystalline silicates and oxide minerals. The purpose of this work is to determine the relation betwe en Al K-edge spectral features and the geometrical arrangements around the aluminium sites. In the different minerals aluminium atoms are ei ther four-fold or six-fold coordinated to oxygen atoms in Al sites tha t are poorly symmetric. The calculations are based on different choice s of one-electron potentials according to aluminium coordinations and crystallographic structures of the compounds.