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- X-ray_absorption_spectroscopy abstract "X-ray absorption spectroscopy (XAS) is a widely used technique for determining the local geometric and/or electronic structure of matter. The experiment is usually performed at synchrotron radiation sources, which provide intense and tunable X-ray beams. Samples can be in the gas-phase, solution, or condensed matter (i.e. solids).XAS data are obtained by tuning the photon energy using a crystalline monochromator to a range where core electrons can be excited(0.1-100 keV photon energy). The "name" of the edge depends upon the core electron which is excited: the principal quantum numbers n=1, 2, and 3, correspond to the K-, L-, and M-edges, respectively. For instance, excitation of a 1s electron occurs at the K-edge, while excitation of a 2s or 2p electron occurs at an L-edge (Figure 1) [1].There are three main regions found on a spectrum generated by XAS data (Figure 2): The "absorption threshold" determined by the transition to the lowest unoccupied states : a) the states at the Fermi energy in metals giving a "rising edge" with an arc tangent shape; b) the bound core excitons in insulators with a Lorentzian line-shape (they occur in a pre-edge region at energies lower than the transitions to the lowest unoccupied level); The X-ray Absorption Near-Edge Structure XANES introduced in 1980 and later in 1983 called also NEXAFS (Near-edge X-ray Absorption Fine Structure) which are dominated by core transitions to quasi bound states (multiple scattering resonances) for photoelectrons with kinetic energy in the range from 10 to 150 eV above the chemical potential, called "shape resonances" in molecular spectra since they are due to final states of short life-time degenerate with the continuum with the Fano line-shape. In this range multi-electron excitations and many-body final states in strongly correlated systems are relevant; In the high kinetic energy range of the photoelectron the scattering cross-section with neighbor atoms is weak and the absorption spectra are dominated by EXAFS (Extended X-ray Absorption Fine Structure) where the scattering of the ejected photoelectron off neighboring atoms can be approximated by single scattering events. After it was shown in 1985 that multiple scattering theory can interpret both XANES and EXAFS the experimental analysis focusing on both regions is called XAFS [2].XAS is a type of absorption spectroscopy from a core initial state with a well defined symmetry therefore the quantum mechanical selection rules select the symmetry of the final states in the continuum which usually are mixture of multiple components. The most intense features are due to electric-dipole allowed transitions (i.e. Δℓ = ± 1) to unoccupied final states. For example, the most intense features of a K-edge are due to core transitions from 1s → p-like final states, while the most intense features of the L3-edge are due to 2p → d-like final states.XAS methodology can be broadly divided into four experimental categories that can give complementary results to each other: Metal K-edge, metal L-edge, ligand K-edge, and EXAFS.".
- X-ray_absorption_spectroscopy thumbnail XASEdges.svg?width=300.
- X-ray_absorption_spectroscopy wikiPageExternalLink XANES%3A_Theory.
- X-ray_absorption_spectroscopy wikiPageExternalLink Tutorials?action=AttachFile&do=view&target=Newville_xas_fundamentals.pdf.
- X-ray_absorption_spectroscopy wikiPageID "2745361".
- X-ray_absorption_spectroscopy wikiPageLength "4959".
- X-ray_absorption_spectroscopy wikiPageOutDegree "51".
- X-ray_absorption_spectroscopy wikiPageRevisionID "677031097".
- X-ray_absorption_spectroscopy wikiPageWikiLink Absorption_spectroscopy.
- X-ray_absorption_spectroscopy wikiPageWikiLink Amorphous_solid.
- X-ray_absorption_spectroscopy wikiPageWikiLink Arc_tangent.
- X-ray_absorption_spectroscopy wikiPageWikiLink Biology.
- X-ray_absorption_spectroscopy wikiPageWikiLink Catalysis.
- X-ray_absorption_spectroscopy wikiPageWikiLink Category:Condensed_matter_physics.
- X-ray_absorption_spectroscopy wikiPageWikiLink Category:Environmental_chemistry.
- X-ray_absorption_spectroscopy wikiPageWikiLink Category:Materials_science.
- X-ray_absorption_spectroscopy wikiPageWikiLink Category:Synchrotron-related_techniques.
- X-ray_absorption_spectroscopy wikiPageWikiLink Category:X-rays.
- X-ray_absorption_spectroscopy wikiPageWikiLink Chemistry.
- X-ray_absorption_spectroscopy wikiPageWikiLink Cluster_chemistry.
- X-ray_absorption_spectroscopy wikiPageWikiLink Condensed_matter_physics.
- X-ray_absorption_spectroscopy wikiPageWikiLink Core_electron.
- X-ray_absorption_spectroscopy wikiPageWikiLink Crystal_structure.
- X-ray_absorption_spectroscopy wikiPageWikiLink Doping_(semiconductor).
- X-ray_absorption_spectroscopy wikiPageWikiLink EXAFS.
- X-ray_absorption_spectroscopy wikiPageWikiLink Earth_science.
- X-ray_absorption_spectroscopy wikiPageWikiLink Electronics.
- X-ray_absorption_spectroscopy wikiPageWikiLink Exciton.
- X-ray_absorption_spectroscopy wikiPageWikiLink Extended_X-ray_absorption_fine_structure.
- X-ray_absorption_spectroscopy wikiPageWikiLink File:XASEdges.svg.
- X-ray_absorption_spectroscopy wikiPageWikiLink File:XASFig.jpg.
- X-ray_absorption_spectroscopy wikiPageWikiLink Inverse_trigonometric_functions.
- X-ray_absorption_spectroscopy wikiPageWikiLink Ion.
- X-ray_absorption_spectroscopy wikiPageWikiLink Ion_implantation.
- X-ray_absorption_spectroscopy wikiPageWikiLink Ligand_K-edge.
- X-ray_absorption_spectroscopy wikiPageWikiLink Liquid.
- X-ray_absorption_spectroscopy wikiPageWikiLink Liquid_water.
- X-ray_absorption_spectroscopy wikiPageWikiLink Materials_science.
- X-ray_absorption_spectroscopy wikiPageWikiLink Materials_science_and_engineering.
- X-ray_absorption_spectroscopy wikiPageWikiLink Metal_K-edge.
- X-ray_absorption_spectroscopy wikiPageWikiLink Metal_L-edge.
- X-ray_absorption_spectroscopy wikiPageWikiLink Metalloprotein.
- X-ray_absorption_spectroscopy wikiPageWikiLink Metalloproteins.
- X-ray_absorption_spectroscopy wikiPageWikiLink Molecular_physics.
- X-ray_absorption_spectroscopy wikiPageWikiLink NEXAFS.
- X-ray_absorption_spectroscopy wikiPageWikiLink Organometallic_chemistry.
- X-ray_absorption_spectroscopy wikiPageWikiLink Photoelectric_effect.
- X-ray_absorption_spectroscopy wikiPageWikiLink Photoelectron.
- X-ray_absorption_spectroscopy wikiPageWikiLink Photon.
- X-ray_absorption_spectroscopy wikiPageWikiLink Principal_quantum_number.
- X-ray_absorption_spectroscopy wikiPageWikiLink Selection_rule.
- X-ray_absorption_spectroscopy wikiPageWikiLink Selection_rules.
- X-ray_absorption_spectroscopy wikiPageWikiLink Solid_solution.
- X-ray_absorption_spectroscopy wikiPageWikiLink Solution.
- X-ray_absorption_spectroscopy wikiPageWikiLink Synchrotron_radiation.
- X-ray_absorption_spectroscopy wikiPageWikiLink Water.
- X-ray_absorption_spectroscopy wikiPageWikiLink X-ray.
- X-ray_absorption_spectroscopy wikiPageWikiLink X-ray_absorption_fine_structure.
- X-ray_absorption_spectroscopy wikiPageWikiLink X-ray_absorption_near_edge_structure.
- X-ray_absorption_spectroscopy wikiPageWikiLink X-ray_crystallography.
- X-ray_absorption_spectroscopy wikiPageWikiLink X-ray_diffraction.
- X-ray_absorption_spectroscopy wikiPageWikiLink XAFS.
- X-ray_absorption_spectroscopy wikiPageWikiLink XANES.
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "X-ray Absorption Spectroscopy (XAS)".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "X-ray absorption spectroscopy".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "X-ray absorption".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "XAS".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "absorption".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "x-ray absorption spectroscopy".
- X-ray_absorption_spectroscopy wikiPageWikiLinkText "x-ray absorption".
- X-ray_absorption_spectroscopy hasPhotoCollection X-ray_absorption_spectroscopy.
- X-ray_absorption_spectroscopy wikiPageUsesTemplate Template:Citation_needed.
- X-ray_absorption_spectroscopy wikiPageUsesTemplate Template:Refimprove.
- X-ray_absorption_spectroscopy subject Category:Condensed_matter_physics.
- X-ray_absorption_spectroscopy subject Category:Environmental_chemistry.
- X-ray_absorption_spectroscopy subject Category:Materials_science.
- X-ray_absorption_spectroscopy subject Category:Synchrotron-related_techniques.
- X-ray_absorption_spectroscopy subject Category:X-rays.
- X-ray_absorption_spectroscopy type Article.
- X-ray_absorption_spectroscopy type Article.
- X-ray_absorption_spectroscopy type Physic.
- X-ray_absorption_spectroscopy type Technique.
- X-ray_absorption_spectroscopy comment "X-ray absorption spectroscopy (XAS) is a widely used technique for determining the local geometric and/or electronic structure of matter. The experiment is usually performed at synchrotron radiation sources, which provide intense and tunable X-ray beams. Samples can be in the gas-phase, solution, or condensed matter (i.e. solids).XAS data are obtained by tuning the photon energy using a crystalline monochromator to a range where core electrons can be excited(0.1-100 keV photon energy).".
- X-ray_absorption_spectroscopy label "X-ray absorption spectroscopy".
- X-ray_absorption_spectroscopy sameAs Röntgenabsorptionsspektroskopie.
- X-ray_absorption_spectroscopy sameAs Spectromxc3xa9trie_dabsorption_des_rayons_X.
- X-ray_absorption_spectroscopy sameAs Spettroscopia_XAS.
- X-ray_absorption_spectroscopy sameAs X線吸収分光法.
- X-ray_absorption_spectroscopy sameAs m.080g7l.
- X-ray_absorption_spectroscopy sameAs Q903103.
- X-ray_absorption_spectroscopy sameAs Q903103.
- X-ray_absorption_spectroscopy sameAs X光吸收光譜.
- X-ray_absorption_spectroscopy wasDerivedFrom X-ray_absorption_spectroscopy?oldid=677031097.
- X-ray_absorption_spectroscopy depiction XASEdges.svg.
- X-ray_absorption_spectroscopy isPrimaryTopicOf X-ray_absorption_spectroscopy.