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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.
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TL;DR: A noted distinction of BL8 is its relatively high sensitivity for studying phosphorous, sulfur and chlorine in diluted systems and its maximum beam size of 14 mm (width) × 1 mm (height), which is suitable for bulk characterization.
Abstract: Beamline BL8 of the Synchrotron Light Research Institute (Thailand) is routinely operated for X-ray absorption spectroscopy (XAS) in an intermediate photon energy range (1.25–10 keV). The photon energy is scanned by using a double-crystal monochromator, the crystal pair of which can be interchanged among KTP(011), InSb(111), Si(111) and Ge(220). The experimental set-up conveniently facilitates XAS measurements in transmission and fluorescence-yield modes at several K-edges of elements ranging from magnesium to zinc. Instrumentation and specification of the beamline and the XAS station are described, together with the determination of the available photon flux [0.1–6 × 1010 photon s−1 (100 mA)−1], energy resolution (1–5 × 10−4) and stability of photon energy calibration (0.07 eV), representing the beamline performance. Data quality and accuracy of XANES and EXAFS measured at BL8 are compared with those of other well established beamlines. A noted distinction of BL8 is its relatively high sensitivity for studying phosphorous, sulfur and chlorine in diluted systems and its maximum beam size of 14 mm (width) × 1 mm (height), which is suitable for bulk characterization.
101 citations
TL;DR: In this paper, the location of dopant ions and the effect of doping level on the photocatalytic activity have been investigated on Co-doped ZnO nanopowders.
100 citations
TL;DR: In this article, the authors attributed an increase in the AB superexchange interaction strength due to a possible enhancement in the magnetic ion concentration in the A-site on milling, as evident from extended x-ray absorption fine structure and in-field Mossbauer measurements.
Abstract: The Neel temperature of Ni0.5Zn0.5Fe2O4 spinel ferrite increases significantly from 538 K in the bulk state to 592 K when the grain size is reduced to 16 nm by milling in a high-energy ball mill. This has been attributed to an increase in the AB superexchange interaction strength due to a possible enhancement in the magnetic ion concentration in the A-site on milling, as is evident from extended x-ray absorption fine structure and in-field Mossbauer measurements. (c) 2005 American Institute of Physics.
100 citations
01 Jan 1986
TL;DR: In this article, the authors describe the extended x-ray absorption fine structure (EXAFS) spectroscopy, which is an important experimental tool for studying local atomic structure in solids.
Abstract: The x-ray absorption spectrum of an atom exhibits sharp edges which correspond to the excitation threshold of the core electrons. If the atom is surrounded by other atoms in a condensed phase, then the absorption cross section above the absorption edge is observed to oscillate, exhibiting an often complex structure that can extend for hundreds of electron volts. These oscillations are aptly called the extended x-ray absorption fine structure (EXAFS). The fundamental understanding of EXAFS has advanced in the last two decades to the point where quantitative theoretical formulations can accurately account for the fine structure. The oscillations of the absorption cross section are due to the interference between the outgoing photoelectron wave and the incoming wave that is generated when the photoelectron scatters off of the atoms that surround the excited atom. Hence, EXAFS contains detailed information about the local environment of a particular type of atom. With the theoretical framework providing a relatively simple means of interpretation. EXAFS spectroscopy has developed into an important experimental tool for studying local atomic structure in solids.
100 citations
TL;DR: In this paper, the carbon $K$ edge in graphite was measured using inelastic-electron-scattering spectroscopy and the extended x-ray absorption fine structure was in good agreement with theory for the first-neighbor atoms at a distance of 1.42 \AA{}.
Abstract: We have measured the carbon $K$ edge in graphite using inelastic-electron-scattering spectroscopy. The extended x-ray absorption fine structure is in good agreement with theory for the first-neighbor atoms at a distance of 1.42 \AA{}. The momentum dependence of the edge structure is in qualitative agreement with a simple band-structure picture. A comparison of the signal counting rates for electron-energy-loss and photoabsorption experiments shows that the energy-loss method is competitive with synchrotron radiation sources up to about 1000 eV.
100 citations