RESONANT SOFT X-RAY EMISSION SPECTROSCOPY OFV₂O₃,VO₂andNaV₂O₅

Abstract

Resonant soft X-ray emission (RSXE) spectra of V2O3, VO2 and NaV2O5 were recorded for a series of excitation energies at resonances of the V L-and O K-absorption band. The V L-and O K-emission in these vanadium oxide bands possess considerable overlap. By resonant excitation we can tune the energy to the absorption thresholds, thereby eliminating this overlap. Hereby we obtain the V 3d and O 2p projected density-of-states of the valence band. Resonant inelastic X-ray scattering (RIXS) is found to be weak in V2O3, which we explain as being due to its metallic character at room temperature. Vanadium dioxide (VO2), semiconducting at room temperature, shows considerable RIXS features only at the O K-emission band. Distinct RIXS structures are visible in the RSXE spectra of the insulator NaV2O5. In the emission spectra excited at the V L-thresholds of this ternary vanadium oxide, ddexcitations of the V dxy subband at an energy loss of −1.7 eV are observed. Our observation, that RIXS is stronger for insulators than for metals, should be taken advantage of for studying insulator-to-metal transitions in vanadium compounds in the future.

Electronic structure in thin film organic semiconductors studied using soft X-ray emission and resonant inelastic X-ray scattering

“…Similar hybridization has been observed in other vanadium oxides, as is illustrated by the spectrum for Cr-doped V 2 O 3 in Fig. 2 [4,5,20], and also appears in the calculated PDOS. SXE has been shown to be a very sensitive method of measuring hybridized states in both the valence band and in shallow core levels in many transition metal oxides [24 -26].…”

Counter‐Intuitive Structural Instability Aroused by Transition Metal Migration in Polyanionic Sodium Ion Host

“…[ 30b ] Besides, the intensity ratio of v and vi at V L 2 edge also shows a similar trend. [ 30b ] On account of the previous studies of V 2 O 3 through resonant soft X‐ray inelastic scattering [ 31 ] and hard X‐ray 2p photoemission, [ 32 ] features i and iv are thought to result from ligand to metal charge transfer (LMCT) process, which can be regarded as the characteristics of V 3+ .…”

Charge transfer at the metal-insulator transition inV2O3thin films by resonant inelastic x-ray scattering

“…Both are plotted as a function of emitted photon energy. Room temperature RIXS has been reported by Schmitt et al 21 for a single crystal of V 2 O 3 . It appears that at room temperature, at least, our thin film samples are closely similar to the crystalline material.…”