Results 131 to 140 of about 1,355 (182)

NEXAFS spectroscopy of conjugated polymers

European Polymer Journal, 2016
Abstract This feature article provides a general introduction to Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy of conjugated polymers as well as a perspective on the information that NEXAFS spectroscopy is able to provide. While conjugated polymers are of interest for a range of applications including organic light-emitting diodes ...
Christopher R Mcneill, Eliot Gann, Lars Thomsen   +2 more
exaly   +2 more sources

On the correct identification of shape resonances in NEXAFS

Surface Science, 1999
Using core level photoemission data from free molecules, it is shown that the putative shape resonances in NEXAFS can be identified unequivocally only by measuring the main line, or single hole, cross-section. This has important consequences for the characterisation of adsorbed molecules using NEXAFS where the technique is used to determine orientation
A Kivimaki, Uwe Hergenhahn, A M Bradshaw   +2 more
exaly   +3 more sources

NEXAFS and XPS studies of nitrosyl chloride

Physical Chemistry Chemical Physics, 2015
The electronic structure of nitrosyl chloride (ClNO) has been investigated in the gas phase by X-ray Photoelectron (XPS) and Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy at the Cl 2p, Cl 2s, N 1s and O 1s edges in a combined experimental and theoretical study.
SCHIO, LUCA, C. Li, S. Monti, P. Salén, V. Yarsyna, R. Feifel, M. Alagia, R. Richter, S. Falcinelli, STRANGES, Stefano, V. Zhaunerchyk, V. Carravetta   +11 more
openaire   +4 more sources

Pharmaceutical Compounds Studied Using NEXAFS

AIP Conference Proceedings, 2007
Total Electron Yield (TEY) oxygen K-edge NEXAFS detects the presence of strongly adsorbed water molecules on poloxamer-coated pharmaceutical actives, which provides a useful spectroscopic indicator for bioavailability. The results are supported by complementary XPS measurements. Carbon K-edge spectra obtained in a high-pressure NEXAFS cell were used in
Booth, Alastair, Murray Booth, A., Braun, Simon, Lonsbourough, Tom, Purton, John, Patel, Sunil, Schroeder, Sven L M   +6 more
openaire   +1 more source

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

Analytical theory of NEXAFS from diatomic molecules

Physical Review B, 1996
Analytical expressions are derived for both the ${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$ and ${\mathrm{\ensuremath{\sigma}}}^{\mathrm{*}}$ resonances in near-edge x-ray-absorption fine-structure (NEXAFS) spectra from diatomic molecules. A simple criterion is formulated for extracting structural parameters (e.g., the bond lengths) of such molecules ...
, Shneerson, , Tysoe, , Saldin
openaire   +2 more sources

Determination of the Electron Escape Depth for NEXAFS Spectroscopy

Langmuir, 2009
A novel method was developed to determine carbon atom density as a function of depth by analyzing the postedge signal in near-edge X-ray absorption fine structure (NEXAFS) spectra. We show that the common assumption in the analysis of NEXAFS data from polymer films, namely, that the carbon atom density is constant as a function of depth, is not valid ...
K E, Sohn, M D, Dimitriou, J, Genzer, D A, Fischer, C J, Hawker, E J, Kramer   +5 more
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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

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

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