Results 191 to 200 of about 45,221 (235)
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The small-atom approximation in EXAFS and surface EXAFS
Journal of Physics C: Solid State Physics, 1988A simplification of the exact curved-wave theory of extended X-ray absorption fine structure (EXAFS) is presented. This simplified theory is obtained from an approximation to the wavefunction which is based on the physics of the scattering process, and it is found to be in good agreement with the exact theory almost down to the absorption edge.
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1983
Focused on metallurgy this paper addresses crystalline systems only, since amorphous metallic alloys have been discussed elsewhere [1]. The outline of this short review will be to show typical metallurgical problems where EXAFS has proved its efficiency. Some problems previously reviewed in the Daresbury meeting will not be recalled [2].
E. Dartyge, A. Fontaine, J. Mimault
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Focused on metallurgy this paper addresses crystalline systems only, since amorphous metallic alloys have been discussed elsewhere [1]. The outline of this short review will be to show typical metallurgical problems where EXAFS has proved its efficiency. Some problems previously reviewed in the Daresbury meeting will not be recalled [2].
E. Dartyge, A. Fontaine, J. Mimault
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EXAFS study of nanocrystalline iron
Physica B: Condensed Matter, 1995Abstract A multiple-scattering EXAFS study of nanocrystalline iron prepared by high-energy ball milling is presented. A dramatic decrease of the coordination numbers, assigned to the presence of a large defect density, is found as a function of the milling time. An “in situ” annealing (up to about 1100°C) is shown to reduce the density of the defects.
DI CICCO, Andrea +3 more
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Journal of Physics: Condensed Matter, 2001
Extended x-ray absorption fine structure (EXAFS) spectroscopy exploits the quantum interference resulting from the scattering of a photoelectron, generated by the excitation of a core level, by the potential of the surrounding atoms. From the interference pattern it is possible to determine the distance and average distribution of the nearest ...
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Extended x-ray absorption fine structure (EXAFS) spectroscopy exploits the quantum interference resulting from the scattering of a photoelectron, generated by the excitation of a core level, by the potential of the surrounding atoms. From the interference pattern it is possible to determine the distance and average distribution of the nearest ...
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EXAFS study of nanocrystalline cobalt
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995Abstract An EXAFS study of the local environment of nanocrystalline cobalt is presented. In order to determine the pair correlation function (PCF) by solving the integral equation we applied a modified regularization algorithm. For nano-Co we obtain an enhanced reduction of the first coordination number (N = 6.4 atoms).
BABANOV YA +4 more
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EXAFS / XANES - Röntgenabsorptionsspektroskopie
2017Rontgenabsorptionsspektren zeigen auf einem stetig abfallenden Untergrund bei elementspezifischen Energien Stufen, an denen der Absorptionskoeffizient abrupt ansteigt. Ursache hierfur ist, dass nur Rontgenphotonen mit einer Energie, die hoher ist als die Bindungsenergie eines Elektrons, absorbiert werden konnen.
Jürgen Bauch, Rüdiger Rosenkranz
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1983
When synchrotron radiation became available it has been possible to reduce the data collection time of one EXAFS spectrum from 2 or 3 weeks using the bremsstrahlung of a conventional generator down to a few minutes when using the white beam provided by a magnet of storage ring.
A. M. Flank +4 more
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When synchrotron radiation became available it has been possible to reduce the data collection time of one EXAFS spectrum from 2 or 3 weeks using the bremsstrahlung of a conventional generator down to a few minutes when using the white beam provided by a magnet of storage ring.
A. M. Flank +4 more
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EXAFS and Surface EXAFS: Principles, Analysis and Applications
1981A discussion is given of principles and analysis methods of the Extended X-ray Absorption Fine Structure (EXAFS) technique with emphasis on applications in surface crystallography. The various detection techniques in use such as transmission, fluorescence, electron yield and ion yield will be discussed and compared with respect to their applicability ...
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2017
Short-range order in amorphous iron-based metal alloys is investigated by the EXAFS-spectroscopy method. According to EXAFS study, the increase of the content of Co atoms in the amorphous metal alloy (AMA) of Fe???Co???B system leads to decrease of the radius of first coordination sphere of the B atom and reduction of the unit-cell volume in a ...
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Short-range order in amorphous iron-based metal alloys is investigated by the EXAFS-spectroscopy method. According to EXAFS study, the increase of the content of Co atoms in the amorphous metal alloy (AMA) of Fe???Co???B system leads to decrease of the radius of first coordination sphere of the B atom and reduction of the unit-cell volume in a ...
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1983
Great progress has been made in the experimental technique to make EXAFS measurements both in the laboratory and at synchrotron facilities. While the great majority of work is now being carried out at synchrotrons, quite a number of laboratory facilities are in use or are being constructed. We will briefly describe the facility that we have at Argonne.
G. S. Knapp +3 more
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Great progress has been made in the experimental technique to make EXAFS measurements both in the laboratory and at synchrotron facilities. While the great majority of work is now being carried out at synchrotrons, quite a number of laboratory facilities are in use or are being constructed. We will briefly describe the facility that we have at Argonne.
G. S. Knapp +3 more
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