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Natural SciencesMaterials SciencePhysicsOptical MaterialsOpticsSpectroscopyAluminum OxidesMetalsOptical Properties Of SolidsX-ray CrystallographyX-ray OpticsX-ray SpectroscopyCrystal Optical ConstantsFar-infrared ObservationsFar-infrared SpectroscopyOptical ConstantsX-ray Absorption SpectroscopyX-ray ChemistryX-ray Spectral Analysis