Results 271 to 280 of about 21,282 (312)
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1984
SbSI and Sb2S3, representative compounds of the AVBVICVII and A V 2 B VI 3 groups respectively, have awakened a remarkable interest for their physical and mechanical properties related to the low dimensional structure.
Dalba, Giuseppe +2 more
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SbSI and Sb2S3, representative compounds of the AVBVICVII and A V 2 B VI 3 groups respectively, have awakened a remarkable interest for their physical and mechanical properties related to the low dimensional structure.
Dalba, Giuseppe +2 more
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1988
In this short review of recent advances in XANES we have discussed the use of this spectroscopy to probe the geometry of local structure via multiple scattering effects in the real space and and the local partial unoccupied density of states in metals via the band structure approach.
Antonio Bianconi, J. Garcia, M. Benfatto
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In this short review of recent advances in XANES we have discussed the use of this spectroscopy to probe the geometry of local structure via multiple scattering effects in the real space and and the local partial unoccupied density of states in metals via the band structure approach.
Antonio Bianconi, J. Garcia, M. Benfatto
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Physica B: Condensed Matter, 1995
Abstract X-ray-absorption near edge structure (XANES) poses many theoretical challenges and a general quantitative theory remains elusive. We have studied structural contributions to XANES based on high-order multiple-scattering (MS) calculations, including X-ray polarization. Ab initio MS calculations of XANES are presented using a code FEFF6X, that
J.J. Rehr +3 more
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Abstract X-ray-absorption near edge structure (XANES) poses many theoretical challenges and a general quantitative theory remains elusive. We have studied structural contributions to XANES based on high-order multiple-scattering (MS) calculations, including X-ray polarization. Ab initio MS calculations of XANES are presented using a code FEFF6X, that
J.J. Rehr +3 more
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2020
In this chapter we will cover the features close to an absorption edge, often called XANES (but sometimes NEXAFS). XANES is an acronym for X-ray Absorption Near-Edge Structure. This is usually considered the region around the absorption edge where there are dramatic changes in the density of states and/or individual transition intensities, so that a ...
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In this chapter we will cover the features close to an absorption edge, often called XANES (but sometimes NEXAFS). XANES is an acronym for X-ray Absorption Near-Edge Structure. This is usually considered the region around the absorption edge where there are dramatic changes in the density of states and/or individual transition intensities, so that a ...
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Aluminium coordination in tektites: A XANES study
American Mineralogist, 2000Al K-edge XANES spectra were recorded for six tektites to obtain information on the local structure around Al. Albite, grossular, and andalusite were used as reference materials for Al in fourfold, sixfold, and five+sixfold coordination, respectively.
G. GIULI +3 more
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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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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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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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