Results 251 to 260 of about 40,331 (294)

XANES and XMCD

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 ...
openaire   +1 more source

XANES Determination of Intraatomic Potentials

Journal of Structural Chemistry, 2004
A new scheme has been developed for determining the parameters of the local one-electron potential in molecules and solids. The scheme is based on interpretation of the experimental X-ray absorption near edge struucture. The scheme is an extension of the method for solving the inverse problem of XANES theory suggested by one of the authors.
Yu. F. Migal, O. M. Kholodova
openaire   +1 more source

XANES micro-imaging and tomography

SPIE Proceedings, 2002
In 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, Andrea Somogyi, A. Bytchkov, Alexandre S. Simionovici   +3 more
openaire   +1 more source

Full Multiple Scattering XANES Calculations

Le Journal de Physique IV, 1997
Ab initio calculations of X-ray absorption near-edge structure (XANES) are carried out by inverting the full multiple-scattering (MS) matrix. Our approach uses the exact Rehr-Albers [1] separable representation of the free propagator G° together with atomic scattering t-matrices and dipole cross sections from FEFF6[2].
B. Ravel, J. J. Rehr
openaire   +1 more source

Bond Length Determination Using XANES

1983
The use of XANES (X-ray Absorption Near Edge Structures) as a tool for determining coordination geometry, symmetry of the unoccupied valence electronic states or effective charge on the absorbing atom has been suggested by several authors [1], [2], [3].
A. Bianconi, M. Dell’Ariccia, A. Gargano, C. R. Natoli   +3 more
openaire   +1 more source

Free small nanoclusters of titanium: XANES study

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007
Abstract X-ray absorption near-edge structure (XANES) spectra at the Ti L 2,3 -edge of small titanium nanoclusters have been studied. XANES spectra have been measured at the GasPhase beamline of Elettra synchrotron radiation facility. For theoretical interpretation of XANES, both self-consistent full multiple-scattering theory within time-dependent ...
V. Mazalova, A. Kravtsova, G. Yalovega, A. Soldatov, P. Piseri, M. Coreno, T. Mazza, C. Lenardi, G. Bongiorno, P. Milani   +9 more
openaire   +4 more sources

Inverse problem in XANES theory

Journal of Structural Chemistry, 2008
The latest results obtained by a method based on the formalism of the poles of the S matrix are reported. The maxima of one-electron origin in the soft X-ray absorption spectra are assigned the coordinates of the S-matrix poles in a complex plane of energies for a model imitating a real system. The oscillator strengths and the heights of maxima are now
openaire   +1 more source

XANES investigation of manganese sulfide solid solutions

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018
A comprehensive study of the valence state and the local coordination character of Mn1-xYbxS (x = 0; 0.01; 0.05) solid solutions has been performed using X-ray absorption spectroscopy combined with finite difference method calculations. The good agreement between experimental and calculated data indicates that cationic substitution does not lead to ...
M.M. Syrokvashin, E.V. Korotaev, I.Yu. Filatova, S.V. Trubina, S.B. Erenburg   +4 more
openaire   +2 more sources

XANES analysis of dried and calcined bones

Materials Science and Engineering: C, 2013
The 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, Gialanella, Stefano, P. B. Aswath   +2 more
openaire   +3 more sources

Aluminium coordination in tektites: A XANES study

American Mineralogist, 2000
Al 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, PRATESI, GIOVANNI, CORAZZA, MARCELLO, CIPRIANI, CURZIO   +3 more
openaire   +3 more sources