Results 231 to 240 of about 9,951 (268)
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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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XANES analysis of dried and calcined bones
Materials Science and Engineering: C, 2013The structure of dried and calcined bones from chicken, bovine, deer, pig, sheep and chamois was examined using X-ray Absorption Near Edge Structure (XANES) spectroscopy. The oxygen K-edge absorption edge indicates that the surface of dried bone has a larger proportion of carbonate than the interior that is made up of phosphates. The phosphorus L and K
J. Rajendran +2 more
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EXAFS and XANES Studies of Calcium Polysaccharides
1987EXAFS studies of the calcium environments in polysaccharides have provided important insights into chain conformation and gel formation. Work on Ca2+ poly(α-D-galacturonate) in solid and gel forms ana on solid Ca2+ oligo(α-L-guluronate) is reviewed, with particular emphasis on the need to choose appropriate models mimicking well defined Ca-O bond ...
Alagna L. +3 more
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The contribution of XANES spectroscopy to tribology
Canadian Journal of Chemistry, 2007X-ray absorption near edge structure spectroscopy (XANES) analysis has been routinely used to study the complex chemical interactions between additives in engine oil and metallic surfaces during high-temperature and pressure reciprocating wear conditions.
M Nicholls +5 more
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XANES micro-imaging and tomography
SPIE Proceedings, 2002In chemistry, x-ray absorption near-edge spectroscopy (XANES) is a well-known and established technique. By scanning the x-ray energy in the vicinity (50-100 eV) of the absorption edge of an element, information can be obtained about the oxidation state of the probed atoms. The (conventional) technique mainly employed until now applies for homogeneous,
Christoph Rau +3 more
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Multiple Scattering Calculations of XANES
1983In this paper I will outline the multiple scattering approach developed at Daresbury for the calculation of X-ray absorption near edge structure (XANES), concentrating on the basic model used and its construction, and give two recent examples of promising applications.
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Inverse problem in the XANES theory
Physica B: Condensed Matter, 1995Abstract A scheme of the determination of geometric microstructure by using experimental shape resonance characteristics is proposed. It is based on the S -matrix pole analysis. The system of square-well potentials as a model of many-atom systems is used.
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Local Geometry by XANES and RXS
2018A brief overview of the capability of x-ray absorption near edge structure (XANES) and resonant x-ray scattering (RXS) in the hard x-ray region to determine the local geometrical structure around the photoabsorbing atom is presented.
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