scholarly journals Dispersive X-Ray Synchrotron Studies of Pt-C Multilayers

1988 ◽  
Vol 143 ◽  
Author(s):  
B. Rodricks ◽  
F. Lamelas ◽  
D. Medjahed ◽  
W. Dos Passos ◽  
R. Smither ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Spectra ◽  
Absorption Edge ◽  
Optical Constants ◽  
Scattering Data ◽  
X Ray ◽  
Simultaneous Acquisition ◽  
Ccd Detector ◽  
Synchrotron Studies ◽  
X Ray Absorption

AbstractWe demonstrate the simultaneous acquisition of high-resolution x-ray absorption spectra and scattering data, using a combination of energy-dispersive optics and a twodimensional CCD detector. Results are presented on the optical constants of Pt and on the reflectivity of a platinum-carbon multilayer at the LIII absorption edge of Pt.

Electron-Vibron Coupling in High-Resolution X-Ray Absorption Spectra of Organic Materials: NTCDA on Ag(111)

2004 ◽  
Vol 93 (14) ◽  
Author(s):  
A. Schöll ◽  
Y. Zou ◽  
L. Kilian ◽  
D. Hübner ◽  
D. Gador ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Spectra ◽  
Organic Materials ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Finite lifetime broadening of calculated X-ray absorption spectra: possible artefacts close to the edge

2018 ◽  
Vol 25 (2) ◽  
pp. 523-528 ◽  
Author(s):  
Ondřej Šipr ◽  
Jiří Vackář ◽  
Ján Minár
Keyword(s):  
Absorption Spectra ◽  
Real Axis ◽  
Absorption Edge ◽  
Spectral Features ◽  
Core Hole ◽  
Energy Component ◽  
X Ray ◽  
The Core ◽  
X Ray Absorption ◽  
Small Imaginary Part

X-ray absorption spectra calculated within an effective one-electron approach have to be broadened to account for the finite lifetime of the core hole. For methods based on Green's function this can be achieved either by adding a small imaginary part to the energy or by convoluting the spectra on the real axis with a Lorentzian. By analyzing the FeK- andL2,3-edge spectra it is demonstrated that these procedures lead to identical results only for energies higher than a few core-level widths above the absorption edge. For energies close to the edge, spurious spectral features may appear if too much weight is put on broadeningviathe imaginary energy component. Special care should be taken for dichroic spectra at edges which comprise several exchange-split core levels, such as theL3-edge of 3dtransition metals.

X-RAY ABSORPTION EVIDENCE FOR THE BACK-DONATION IN IRON CYANIDE COMPLEXES

2002 ◽  
Vol 09 (01) ◽  
pp. 359-364 ◽  
Author(s):  
A. S. VINOGRADOV ◽  
A. B. PREOBRAJENSKI ◽  
S. A. KRASNIKOV ◽  
T. CHASSÉ ◽  
R. SZARGAN ◽  
...  
Keyword(s):  
Charge Transfer ◽  
High Resolution ◽  
Absorption Spectra ◽  
Spectral Characteristics ◽  
X Ray ◽  
Iron Cyanide ◽  
Cyanide Complexes ◽  
Cyanide Ligands ◽  
X Ray Absorption ◽  
Back Donation

High-resolution, uniformly calibrated Fe 2p 3/2 absorption spectra of various Fe(II) and Fe(III) compounds with the metal atom octahedrally coordinated to atomic and molecular ligands are analyzed expecting changes in the absorption spectra due to differences in the formal valence state and in the character of the chemical bond. Particular attention is given to revealing spectral characteristics of the 3d π–2π(π*) charge transfer (π-back-donation effect) between the iron atom and cyanide ligands.

X-RAY ABSORPTION SPECTRA OF SOME SMALL POLYATOMIC MOLECULES

2002 ◽  
Vol 09 (01) ◽  
pp. 159-164 ◽  
Author(s):  
K. C. PRINCE ◽  
R. RICHTER ◽  
M. DE SIMONE ◽  
M. CORENO
Keyword(s):  
Fine Structure ◽  
Excited State ◽  
High Resolution ◽  
Formic Acid ◽  
Absorption Spectra ◽  
Organic Molecules ◽  
Polyatomic Molecules ◽  
X Ray ◽  
Vibrational Progression ◽  
X Ray Absorption

We report the Near Edge X-ray Absorption Fine Structure Spectra (NEXAFS) of a series of oxygen-containing organic molecules, namely formaldehyde, acetaldehyde, acetone, formic acid, methanol and dimethyl ether (DME), measured with high resolution at the carbon and oxygen edges. A vibrational progression has been observed at the oxygen 1s → π* resonance of formaldehyde, indicating that this state is bound with an excited state C=O stretching frequency of 136 meV. The spectra are compared with previous measurements and the applicability of the chromophore concept is tested for the functional groups present in these molecules.

Vibronic fine structure in high-resolution x-ray absorption spectra from ion-bombarded boron nitride nanotubes

2013 ◽  
Vol 31 (3) ◽  
pp. 031405 ◽  
Author(s):  
Mladen Petravic ◽  
Robert Peter ◽  
Marijana Varasanec ◽  
Lu Hua Li ◽  
Ying Chen ◽  
...  
Keyword(s):  
Fine Structure ◽  
High Resolution ◽  
Boron Nitride ◽  
Absorption Spectra ◽  
Boron Nitride Nanotubes ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Theoretical Modelling of High-Resolution X-Ray Absorption Spectra at Uranium M4 Edge

MRS Advances ◽  
2018 ◽  
Vol 3 (53) ◽  
pp. 3143-3148 ◽  
Author(s):  
Jindřich Kolorenč ◽  
Kristina O. Kvashnina
Keyword(s):  
High Resolution ◽  
Absorption Spectra ◽  
Density Functional ◽  
Theoretical Modelling ◽  
Functional Theory ◽  
X Ray ◽  
Impurity Model ◽  
The Density Functional Theory ◽  
Anderson Impurity Model ◽  
X Ray Absorption

ABSTRACTWe investigate the origin of satellite features that appear in the high-resolution x-ray absorption spectra measured at the uranium M4 edge in compounds where the uranium atoms are in the U6+ oxidation state. We employ a material-specific Anderson impurity model derived from the electronic structure obtained by the density-functional theory.

A comparison of fine structures in high-resolution x-ray-absorption spectra of various condensed organic molecules

2005 ◽  
Vol 123 (4) ◽  
pp. 044509 ◽  
Author(s):  
A. Schoell ◽  
Y. Zou ◽  
D. Huebner ◽  
S. G. Urquhart ◽  
Th. Schmidt ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Spectra ◽  
Organic Molecules ◽  
X Ray ◽  
Fine Structures ◽  
X Ray Absorption
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