Angle dependent soft-X-ray absorption spectroscopy of V₂O₅

Abstract

We have measured the V 2p_3/2 and O 1s X-ray absorption spectra of singlecrystal V₂O₅ and compared them with linear-combination-of-atomic-orbitals density-of-states (DOS) calculations. The spectra change dramatically with incident angle and the use of polarized light and a single crystal limits the number of transitions possible, revealing spectral features that cannot be resolved using polycrystals (angle integrated). The measured O 1s and V 2p_3/2 spectra agree with the projected unoccupied O 2p and V 3d DOSs respectively, indicating that atomic effects alone cannot adequately describe the absorption spectrum, but that solid-state effects, including V-O hybridization, must be included.