Topic
Extended X-ray absorption fine structure
About: Extended X-ray absorption fine structure is a research topic. Over the lifetime, 10452 publications have been published within this topic receiving 276744 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the mechanism of Ni uptake on montmorillonite, at pH 8, high ionic strength (0.2 M Ca(NO3)2), initial Ni concentration of 660 μM, and solid concentration of 5.3 g/L, was investigated.
100 citations
TL;DR: The Extended X-ray Absorption Fine Structure (EXAFS) spectra of pure iron, pure platinum and intermetallic compound Fe 2 Zr, whose structures were well krown, have been measured at lower temperatures (20 K-300 K) and the accuracy of the interatomic distance determination has been estimated as discussed by the authors.
Abstract: The Extended X-ray Absorption Fine Structure (EXAFS) spectra of pure iron, pure platinum and intermetallic compound Fe 2 Zr, whose strtuctures were well krown, have been measured at lower temperatures (20 K–300 K), and the accuracy of the interatomic-distance determination has been estimated In order to increase the accuracy in determining the values of the structural parameters, the FABM technique proposed by Teo et al has been applied In our results, however the accuracy of the interatomic distance under various temperature could be improved almost an order of magnitude by assuming that the inflection point on the absorption edge represents the edge position
100 citations
TL;DR: In this article, the authors performed a quantitative investigation of the energy of thermally induced sp3→sp2 conversion of carbon-carbon bonds in tetrahedral amorphous carbon (ta-C) films by using near-edge x-ray absorption fine structure (NEXAFS) and Raman spectroscopy.
Abstract: We perform a quantitative investigation of the energetics of thermally induced sp3→sp2 conversion of carbon-carbon bonds in tetrahedral amorphous carbon (ta-C) films by using near-edge x-ray absorption fine structure (NEXAFS) and Raman spectroscopy. We investigate the evolution of the bonding configuration in ta-C thin films subjected to high temperature annealing in flowing Argon gas using a rapid thermal annealing furnace over the range of 200–1000 °C. We observe no substantial change in bonding structure below 600 °C. Changes in the NEXAFS and Raman spectra start to appear above 600 °C, and by 1000 °C a significant increase in the sp2 bonding in the film is observed. No oxygen bonding is detected in the NEXAFS spectra, but we do observe an isosbestic point, demonstrating that the thermally driven sp3→sp2 conversion reaction occurs without passing through an intermediate transition state. This allows us to use NEXAFS spectra of thermally annealed ta-C films to quantitatively determine that the activation energy for directly converting the sp3-bonded carbon to the sp2-bonded configuration is 3.5±0.9 eV.
100 citations
TL;DR: In this paper, the absorption coefficient for sputtered InAs films was determined in the region of the absorption edge by the analysis of transmission and reflection spectra, assuming that the sample material can be described by a model of microcrystallites immersed in an amorphous matrix.
100 citations
TL;DR: In this article, extended x-ray absorption fine structure (EXAFS) data indicate that reduced xanthine oxidase contains molybdenum in the four valence oxidation state.
Abstract: Xanthine oxidase was isolated from unpasteurized buttermilk by a standard procedure. Extended x-ray absorption fine structure (EXAFS) data indicate that reduced xanthine oxidase contains molybdenum in the four valence oxidation state. Curve fitting of the EXAFS data for oxidized xanthine oxidase suggests that there are two different Mo-ligand distances, 1.5 oxygen atoms at 1.71 A and 2 sulfur atoms at 2.54 A. Including a third sulfur atom at a longer distance significantly improved the fit. Several possible formulations are proposed. 2 figures, 1 table.
100 citations