Results 171 to 180 of about 10,008 (214)

NEXAFS spectromicroscopy of suspended carbon nanohorns

Chemical Physics Letters, 2013
Abstract We demonstrate that near-edge X-ray-absorption fine-structure spectroscopy combined with full-field transmission X-ray microscopy can be used to study the electronic structure of suspended carbon nanohorns. Based on reports of electronic structure calculations additional spectral features observed in the π region of the NEXAFS spectrum ...
Carla Bittencourt, Xiaoxing Ke, Gustaaf Van Tendeloo, Nikos Tagmatarchis, Peter Guttmann   +4 more
openaire   +4 more sources

The NEXAFS of biological calcium phosphates

Review of Scientific Instruments, 1995
The absorption cross section of a number of calcium salts has been assessed at the calcium L edge by measuring the total electron yield (TEY) at the NSLS U13UA beamline. TEY was used because of distortions introduced by instrumentation when using a transmission signal. The effect of these distortions has been evaluated and is presented.
C. J. Buckley, S. J. Bellamy, X. Zhang, G. Dermody, S. Hulbert   +4 more
openaire   +1 more source

NEXAFS Spectra of Polymer‐nanocarbon Composites

Fullerenes, Nanotubes and Carbon Nanostructures, 2008
The 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, M. M. Brzhezinskaya, A. S. Vinogradov, K. Friedrich   +3 more
openaire   +1 more source

Recent progress in EXAFS/NEXAFS spectroscopy

Journal of Electron Spectroscopy and Related Phenomena, 2014
Abstract 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, Takashi Fujikawa, Nobuyuki Ichikuni   +2 more
openaire   +1 more source

New developments in NEXAFS/EXAFS theory

Catalysis Today, 1998
Abstract 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
openaire   +1 more source

NEXAFS study of 2LiF–MgB2 composite

International Journal of Hydrogen Energy, 2012
Abstract 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, J.M. Ramallo-López, F.G. Requejo, K. Suarez-Alcantara, J. Bellosta von Colbe, J. Avila   +5 more
openaire   +1 more source

NMR and NEXAFS Study of Various Graphite Fluorides

The Journal of Physical Chemistry C, 2013
Graphite fluorides with different structural types (CyF)n (y = 2.5, 2, and 1) and room temperature graphite fluorides were studied by solid state NMR and NEXAFS. Data extracted from those two techniques are complementary, providing information about the C-F bonding and the hybridization character of the carbon atom valence states.
Ahmad, Yasser, Dubois, M., Guérin, K., Hamwi, A., Fawal, Z., P. Kharitonov, A., V. Generalov, A., Yu. Klyushin, A., A. Simonov, K., Vinogradov, N.A., A. Zhdanov, I., B. Preobrajenski, A., S. Vinogradov, A.   +12 more
openaire   +2 more sources

PEEM and μ-NEXAFS of CuInS2-surfaces

Thin Solid Films, 2003
Abstract Polycrystalline CuInS 2 samples are an ideal system for photoemission electron microscope studies. The polycrystalline grains have a diameter of approximately 5 μm and the system is expected to be highly inhomogeneous because of the existence of many sub-phases.
K. Müller, Y. Burkov, D. Schmeißer
openaire   +1 more source

Calculations of NEXAFS Spectra of Substituted Benzenes

Le Journal de Physique IV, 1997
We examine the role of substituent strengths and positions for NEXAFS spectra of substituted benzenes by means of static exchange calculations on aniline, phenol, fluorobenzene, and terephthalaldehyde. Chemical shifts and intensities of the ls → π* excitations are found to be closely related to the electronegative character of the substituent group ...
L. Yang, O. Plachkevytch, H. Ågren, L. G.M. Pettersson   +3 more
openaire   +1 more source

Selected Applications of NEXAFS

1992
Here 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 ...
openaire   +1 more source