Results 331 to 340 of about 1,135,801 (376)

Photoacoustic X-Ray Absorption Spectroscopy

1988
When materials are irradiated by X-rays, several effects occur, e. g. absorption, scattering, fluorescence, and electron release, as seen in Fig. 1. Heat generation should also be observed on absorption of electromagnetic waves even for the X-ray absorption process.
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X-ray Absorption Spectroscopy of Selenate Reductase

Inorganic Chemistry, 2003
The metal sites of selenate reductase from Thauera selenatis have been characterized by Mo, Se, and Fe K-edge X-ray absorption spectroscopy. The Mo site of the oxidized enzyme has 3 to 4 sulfur ligands at 2.33 A from two molybdopterin cofactors, one Mo=O group at 1.68 A and one Mo-O with an intermediate bond length of 1.81 A.
Prince, Roger C., Pickering, Ingrid J., Santini, Joanne., Maher, Megan., George, Graham N., Macy, Joan.   +5 more
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X-RAY ABSORPTION SPECTROSCOPY OF BIOLOGICAL MOLECULES

Annual Review of Biophysics and Bioengineering, 1978
The advent of intense, tuneable x-ray sources has made possible a new field of spectroscopy for the study of local molecular structure and chemical properties of specific atoms in biological molecules. Biological applications of synchrotron radia­tion to date have used x rays emerging from a beryllium window, and hence of relatively short wavelength ...
R G, Shulman, P, Eisenberger, B M, Kincaid   +2 more
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Branching ratio in x-ray absorption spectroscopy

Physical Review B, 1988
The origin of nonstatistical branching ratios in spin-orbit-split x-ray absorption spectra is explained. Atomic calculations for transition metals show a systematic change which is due to initial-state spin-orbit splitting and electrostatic interactions between core hole and valence electrons. We have formulated the results of these atomic calculations
Thole, B. T., Van der Laan, G.
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X‐ray absorption spectroscopy

Berichte der Bunsengesellschaft für physikalische Chemie, 1987
AbstractThe X‐ray absorption near‐edge structure (XANES) of transition metal oxides is analyzed in terms of scattering resonances from neighboring atoms. Spectra from reference compounds of simple, known structure were used to facilitate identification of XANES peaks with scattering from specific coordination spheres.
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X-ray Absorption Spectroscopy of CuO2 Chains

Journal of Low Temperature Physics, 2003
The electronic structure of various edge-shared chain compounds A1−x CuO2 (A=Ca,Sr,Ba) was studied by O-K and Cu-L3 x-ray absorption spectroscopy and exact diagonalizations techniques. The doping-dependent behaviour in these chains differs from that of conventional 2D Cu-O networks of cornershared CuO4 plaquettes due to the much smaller inter-plaquette
Drechsler, S.L., Hu, Z., Malek, J., Rosner, H., Neudert, R., Knupfer, M., Golden, M.S., Fink, J.   +7 more
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Recent advances in x-ray absorption spectroscopy

Reports on Progress in Physics, 2004
Using x-ray absorption spectroscopy recent progress is achieved all over in solid state physics. This review focuses on these advances, with particular emphasis on applications to surface physics and to magnetism of ultrathin 3d and 5d films that are made possible by the use of undulators in third generation synchrotron radiation sources: the ...
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Glancing Angle X-Ray Absorption Spectroscopy

Advances in X-ray Analysis, 1990
AbstractThe use of glancing angles of incidence enables X-ray Absorption Spectroscopy to be measured as a function of depth from the surface of a material into the bulk. As x-rays rather than photoelectrons are detected, a UHV environment is not required and instead surfaces and interfaces can be examined under realistic operational conditions.
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X-Ray Absorption Spectroscopy: EXAFS and XANES

1994
The discovery of X-rays by Roentgen in 1891 allowed study of crystalline materials on an atomic scale. The X-ray energy range is of the order of 1 keV, which corresponds to wavelengths of 10 A.
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In Situ/Operando Electrocatalyst Characterization by X-ray Absorption Spectroscopy

Chemical Reviews, 2021
Jänis Timoshenko, Beatriz Roldan Cuenya   +1 more
exaly