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XANES
About: XANES is a research topic. Over the lifetime, 7737 publications have been published within this topic receiving 188032 citations.
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TL;DR: A combination of neutron diffraction and X-ray absorption spectroscopic techniques has been used to investigate the Ti coordination in vitreous K2O· TiO2 · 2SiO2 as discussed by the authors.
Abstract: A combination of neutron diffraction and X-ray absorption spectroscopic techniques has been used to investigate the Ti coordination in vitreous K2O· TiO2 · 2SiO2. In the former case, the Tizz.sbnd;O bond lengths have been studied using the technique of isotopic substitution. XANES (X-ray absorption near-edge structure) data indicate that there is little or no evidence for a centre of inversion symmetry at the Ti site in the glass. TiO bond distances derived from neutron diffrraction and EXAFS (extended X-ray absorption fine structure) agree to within 0.03 A and it is concluded that the Ti is present as TiO5 tetragonal pyramids containing one non-bridging oxygen atom associated witth a titanyl bond (Ti=0 = 1.65 A). The bridging TiO bond length is 1.96 A and TiTi correlations occur at 3.4 A and 6.1 A.
107 citations
TL;DR: Two-dimensional C Kα RIXS mapping of the heavy reduction of rGOs further confirms that the residual oxygen and/or oxygen-containing functional groups modify the π and σ features, which are dispersed by the photon excitation energy.
Abstract: Electronic structures of graphene oxide (GO) and hydro-thermally reduced graphene oxides (rGOs) processed at low temperatures (120–180°C) were studied using X-ray absorption near-edge structure (XANES), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS). C K-edge XANES spectra of rGOs reveal that thermal reduction restores C = C sp2 bonds and removes some of the oxygen and hydroxyl groups of GO, which initiates the evolution of carbonaceous species. The combination of C K-edge XANES and Kα XES spectra shows that the overlapping π and π* orbitals in rGOs and GO are similar to that of highly ordered pyrolytic graphite (HOPG), which has no band-gap. C Kα RIXS spectra provide evidence that thermal reduction changes the density of states (DOSs) that is generated in the π-region and/or in the gap between the π and π* levels of the GO and rGOs. Two-dimensional C Kα RIXS mapping of the heavy reduction of rGOs further confirms that the residual oxygen and/or oxygen-containing functional groups modify the π and σ features, which are dispersed by the photon excitation energy. The dispersion behavior near the K point is approximately linear and differs from the parabolic-like dispersion observed in HOPG.
107 citations
TL;DR: In this article, the authors investigated the adsorption and molecular ordering of CH 3 (CH 2 ) 21 SH self-assembled monolayers prepared by immersing polycrystalline silver substates in a 3 μ mol ethanol solution.
107 citations
107 citations
TL;DR: In this paper, the evolution of solid state N-doping in graphene has been probed using X-ray absorption near-edge structure (XANES) spectroscopy, and the results indicate that the electronic structure of graphene can be controlled by solid state treatment, involving different N species depending on the annealing process.
107 citations