Results 181 to 190 of about 4,600 (221)
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NEXAFS Spectra of Polymer‐nanocarbon Composites
Fullerenes, Nanotubes and Carbon Nanostructures, 2008The near edge X‐ray absorption fine structure (NEXAFS) spectra of polymethylmetacrylate (PMMA)‐fullerene (Fu) C60 and PMMA‐multiwall nanotubes (MWNT) composites treated at different temperatures are compared to the thermal desorption (TD) mass‐spectrometric (MS) spectra.
A. O. Pozdnyakov +3 more
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Recent progress in EXAFS/NEXAFS spectroscopy
Journal of Electron Spectroscopy and Related Phenomena, 2014Abstract We briefly review the basic theory and recent applications in the X-ray absorption fine structure (XAFS) spectroscopy. First we discuss a dressed one-electron XAFS formula starting from many-body scattering theory, where important many-body effects, intrinsic and extrinsic losses, and optical potential are naturally introduced. Next multiple
Akihiro Koide +2 more
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NEXAFS investigations of cyclooctatetraene on TiO2(001)
Surface Science, 2001Abstract Near-edge X-ray absorption fine structure (NEXAFS) was used to examine the nature of the adsorbed intermediate in the ring contraction of cyclooctatetraene (COT) to form benzene. Formation of aromatics by alkyne cyclotrimerization has been proposed to occur via a metallacyclopentadiene intermediate, and the chemistry of COT on reduced TiO 2
A.B Sherrill +3 more
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Selected Applications of NEXAFS
1992Here we discuss selected examples of how NEXAFS has been used to obtain information on the electronic and crystallographic structure of molecular adsorption systems. Our examples cover a wide range of molecular adsorption energies, from weak van-der-Waals like interactions to strong chemical bonds, and address a diversity of molecules, ranging from ...
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On the interpretation of the NEXAFS spectrum of molecular oxygen
Chemical Physics Letters, 1996Abstract Calculations with extended basis sets and full intrachannel coupling of discrete and continuum states suggest an alternative interpretation of the NEXAFS spectrum of molecular oxygen. In this interpretation the roles of valence-Rydberg mixing and intrachannel discrete-continuum interaction are stressed at the expense of the exchange ...
Agren H +4 more
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An ARUPS/NEXAFS study of the adsorbate system
Applied Surface Science, 1996Abstract The room temperature adsorption of H 2 S on InP(110) may be understood as a cooperative dissociation in which H + and SH − bond to the surface anion and cation, respectively. Synchrotron radiation angle resolved ultraviolet photoelectron spectroscopy (ARUPS) and near edge X-ray absorption fine structure (NEXAFS) are used to probe the ...
E. Dudzik +5 more
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Principles, Techniques, and Instrumentation of NEXAFS
1992In this chapter a basic question is addressed: How can the X-ray absorption signal from a single molecular layer on the surface of a bulk material be measured? In particular, electron yield and fluorescence yield detectors and experimental techniques are discussed and specific attention is given to the problems of normalization and background ...
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New developments in NEXAFS/EXAFS theory
Catalysis Today, 1998Abstract Recent advances in the theory of X-ray absorption fine structure (XAFS) are reviewed. Modern ab initio multiple-scattering (MS) calculations now provide an accurate, unified treatment of XAFS, encompassing both EXAFS (extended-XAFS), NEXAFS (near-edge XAFS) and XANES (X-ray absorption near-edge structure).
J.J. Rehr, A. Ankudinov, S.I. Zabinsky
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NEXAFS study of 2LiF–MgB2 composite
International Journal of Hydrogen Energy, 2012Abstract Synthesis of lithium borohydridofluorides may pave a new way to pursue improved hydrogen storage properties of LiBH 4 as reversible hydrogen storage materials that fit the fuel cell application. The main products of the hydrogen absorption by 2LiF–MgB 2 composite are MgF 2 and LiBH 4 .
I. Saldan +5 more
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Adenine adlayers on Cu(111): XPS and NEXAFS study
The Journal of Chemical Physics, 2015The adsorption of adenine on Cu(111) was studied by photoelectron and near edge x-ray absorption fine structure spectroscopy. Disordered molecular films were deposited by means of physical vapor deposition on the substrate at room temperature. Adenine chemisorbs on the Cu(111) surface with strong rehybridization of the molecular orbitals and the Cu 3d ...
Nataliya Tsud +5 more
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