Search results for "extended x-ray absorption fine structure"

showing 3 items of 193 documents

A surface EXAFS study of thin nickel deposits on (110) TiO2 surfaces

1997

Abstract The first stages of nickel deposition on a clean (110) TiO 2 surface were studied using surface extended X-ray absorption fine structure (EXAFS). Experiments were performed on two kinds of nickel deposits, one of 0.8 equivalent monolayers and another of 1.6 equivalent monolayers. Depositions were performed on well characterized TiO 2 (110)-p(1 × 1) surfaces. The correlation of Auger experiments with EXAFS results showed that no islands were present on the surface; only two-dimensional growth of nickel was observed. Moreover, it was shown, in the case of the thinner deposit, that a model with nickel atoms forming chains in the channels determined by oxygen atoms on the surface is co…

inorganic chemicalsSurface (mathematics)Extended X-ray absorption fine structureChemistryMetals and AlloysAnalytical chemistryNickel depositionchemistry.chemical_elementSurfaces and InterfacesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAugerCrystallographyNickelOxygen atomMonolayerMaterials ChemistryAbsorption (chemistry)Thin Solid Films
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Pd2Au36(SR)(24) cluster: structure studies

2015

The location of the Pd atoms in Pd2Au36(SC2H4Ph)(24), is studied both experimentally and theoretically. X-ray photoelectron spectroscopy (XPS) indicates oxidized Pd atoms. Palladium K-edge extended X-ray absorption fine-structure (EXAFS) data clearly show Pd-S bonds, which is supported by far infrared spectroscopy and by comparing theoretical EXAFS spectra in R space and circular dichroism spectra of the staple, surface and core doped structures with experimental spectra.

spectroscopyAtomsElectronic-propertiesnanoclustersMass-spectrometrychemistry.chemical_elementNanotechnologyCrystal structureSpectral lineÀtomsCondensed Matter::Materials ScienceX-ray photoelectron spectroscopyOptical-propertiesCondensed Matter::SuperconductivityRay-absorption spectroscopyCluster (physics):Física::Electromagnetisme [Àrees temàtiques de la UPC]General Materials ScienceGold nanoclustersta116Theoretical-analysista114Extended X-ray absorption fine structureDopingProtected au-25 nanoclustersEspectroscòpia de raigs XCrystallographyLigand-exchangechemistryCrystal-structureddc:540X-ray spectroscopyNanoparticles:Física::Física molecular [Àrees temàtiques de la UPC]Absorption (chemistry)Palladium
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Spectroscopic characterization of alkaline earth uranyl carbonates

2005

A series of alkaline uranyl carbonates, M[UO{sub 2}(CO{sub 3}){sub 3}].nH{sub 2}O (M=Mg{sub 2}, Ca{sub 2}, Sr{sub 2}, Ba{sub 2}, Na{sub 2}Ca, and CaMg) was synthesized and characterized by inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectrometry (AAS) after nitric acid digestion, X-ray powder diffraction (XRD), and thermal analysis (TGA/DTA). The molecular structure of these compounds was characterized by extended X-ray absorption fine-structure (EXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS). Crystalline Ba{sub 2}[UO{sub 2}(CO{sub 3}){sub 3}].6H{sub 2}O was obtained for the first time. The EXAFS analysis showed that this compound consists of …

spectroscopysynthesisAbsorption spectroscopyTRLFSAnalytical chemistryElectron spectroscopyUranyl carbonateuraniumInorganic Chemistrycarbonatechemistry.chemical_compoundXPSMaterials ChemistrystructurePhysical and Theoretical ChemistrySpectroscopyX-ray spectroscopyExtended X-ray absorption fine structureChemistryCondensed Matter PhysicsUranylalkaline earthElectronic Optical and Magnetic MaterialsEXAFSX-ray crystallographyCeramics and CompositesJournal of Solid State Chemistry
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