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2 edition of X-ray absorption fine structure of adsorbates on metal surfaces found in the catalog.

X-ray absorption fine structure of adsorbates on metal surfaces

Michael Derek Crapper

X-ray absorption fine structure of adsorbates on metal surfaces

by Michael Derek Crapper

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Published by typescript in [s.l.] .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Warwick, 1986.

StatementMichael Derek Crapper.
ID Numbers
Open LibraryOL13863927M

In the latter application, X-ray standing wave (XSW) and x-ray truncation rod methods are very sensitive to the geometric structure of oxide and sulfide surfaces and adsorbates on these surfaces, whereas photoemission spectroscopy (PES) is sensitive to the electronic structures of these surfaces and adsorbate molecules. to search for water structures that reproduce diffraction, IR/Raman and x-ray absorption by fitting them to experimental data and imposed constraints. Some of the structures are created to have a large fraction of broken hydrogen bonds because recent x-ray absorption and emission studies have been seen to support the existence of such structures.

X-ray Absorption Fine Structure. X-ray absorption fine structure (XAFS) spectroscopy, also named X-ray absorption spectroscopy, is a technique that can be applied for a wide variety of disciplines because the measurements can be performed on solids, gasses, or liquids, including moist or dry soils, glasses, films, membranes, suspensions or pastes, and aqueous solutions. In situ X-ray absorption spectroscopy (XAS) results on correlating the Pt local coordination and electronic structure with the Pt/C catalyst activity and selectivity during aqueous reforming of glycerol at different pH are reported. The results show that both low and high pH favor C–O cleavage over that of C–C. However, the selectivity toward C–O bond cleavage was higher under the acidic.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. The X-ray Absorption Near-Edge Structure introduced in and later in , also called NEXAFS (Near-edge X-ray Absorption Fine Structure) which are dominated by core transitions to quasi bound states (multiple scattering resonances) for photoelectrons with kinetic energy in the range from 10 to eV above the chemical potential, called "shape resonances" in molecular spectra since they.


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X-ray absorption fine structure of adsorbates on metal surfaces by Michael Derek Crapper Download PDF EPUB FB2

Surface exended X-ray absorption fine structure of copper on a platinum electrode In this work we use a semiempirical method to calculate theoretical it frequencies for model cyanide and thiocyanate adsorbates on various metal surfaces. The predicted it energies for the surface species are then compared with the observed experimental Cited by: 6.

In recent years, the more conventional extended x-ray absorption fine structure (EXAFS) data analysis technique has been complemented by the Δμ XANES technique, which uses a difference method to isolate the changes in the X-ray absorption near edge structure (XANES) due to adsorbates on a metal surface.

With Δμ XANES it is possible to determine the adsorbate, the Author: D.E. Ramaker, C. Roth. Here, we apply X-ray absorption spectroscopies, i.e., near edge (XANES) and extended fine structure (EXAFS), supported by ab initio simulations, to clarify the state of adsorbates on carbon-supported Pt for the aqueous hydrogenation of phenol by H 2 or H + aq without and with applied electrochemical potential.

By using small metal particles Cited by: 8. The structural techniques of SEXAFS. NEXAFS and photoelectron diffraction have been applied to several adsorption systems.

In combination they have allowed detailed surface structural studies to be achieved and the usefulness of these complementary techniques (which employ the same experimental geometry) has been demonstrated. SEXAFS studies have been carried out for atomic and molecular Author: Michael Derek Crapper.

Structure of Metal Surfaces & Adsorbates. Reinhold Koch; K. Rieder; Goal: reconstruction of (stepped) (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy.

In. The availability of intense, tunable, polarized X-radiation from electron storage rings has led to the successful application of surface extended X-ray absorption fine structure (s.e.X.a.f.s.) measurements to the determination of inter-atomic spacings and, by using multishell analyses, complete structures for adsorbates on surfaces.

Recent work on a surface iodide structure on Ni{}, Ag{ Extended X-Ray Absorption Fine Structure (EXAFS), along with X-ray Absorption Near Edge Structure (), is a subset of X-ray Absorption Spectroscopy ().Like other absorption spectroscopies, XAS techniques follow Beer's X-ray absorption coefficient of a material as a function of energy is obtained using X-rays of a narrow energy resolution are directed at a sample and the incident and.

A near edge X-ray absorption fine structure study of the adsorption of pyrrole and N-methylpyrrole on Pt(): Orientation and dissociation of the adsorbed molecules. Surface Science. X-ray absorption spectroscopy (XAS) is a widely used technique for determining the local geometric and/or electronic structure of matter, and indeed it represents another tool which has been widely used to study hydrogenases, because it can give valuable information about the oxidation state of a metal ion (by x-ray absorption near-edge.

Temperature-dependent surface extended x-ray-absorption fine-structure (SEXAFS) measurements on half a monolayer of O and N atoms on Ni() and Cu() surfaces indicate enhanced anharmonic contributions in the adsorbate-substrate pair potential, with respect to bulk values.

From the temperature dependence of the SEXAFS amplitude and phase we calculate the thermal expansion coefficients. John Wiley & Sons, This book gives excellent overview of many of synchrotron X-ray methods.

It incudes a brief but very good section on X-ray absorption, EXAFS, and dichroism. ISBN, Publisher, Amazon. X-ray Absorption Spectroscopy for the Chemical and Materials Sciences, John Evans, John Wiley & Sons, ISBN, Publisher, Amazon.

X-ray absorption fine structure (XAFS) spectroscopy has been widely used for decades in a wide range of scientific fields, including physics, chemistry, biology, materials sciences, environmental sciences, etc. This review article is devoted to the applications of XAFS in nanomaterials. The basic principles of XAFS are briefly described from the view point of practical application, including.

Photoemission extended x-ray absorption fine structure (PEXAFS) has been developed as a new technique for determining the atomic structures of surfaces and adsorbates on surfaces. PEXAFS has several unique advantages over other EXAFS methods that should make it attractive for use by other surface scientists.

We have applied it to studies of the oxidation of technologically important. Using a combination of x-ray standing waves and surface extended x-ray-absorption fine structure, we have determined the interlayer relaxation of a metal surface in the presence of an adsorbate.

X-ray absorption fine structure of adsorbates on metal surfaces Author: Crapper, Michael Derek ISNI: Awarding Body: University of Warwick Current Institution: University of Warwick Date of Award: Availability of Full Text. Roy L. Johnston, in Frontiers of Nanoscience, X-ray Absorption Spectroscopy.

X-ray absorption spectroscopy (XAS) comprises a number of related techniques (EXAFS, XANES) and is useful for probing the internal structures of MNPs and adsorbates. 40 Its use has increased due to the availability of synchrotron radiation facilities around the world. Among these techniques, near edge X-ray absorption fine structure (NEXAFS) spectroscopy is one of the most powerful tools thanks to its elemental specificity, surface sensitivity, and ability to provide important information about local bonding configurations, such as hybridization, chemical states, and bond orientations.

XAFS (X-ray absorption fine structure) and XMCD (X In this proceeding, we will present following two topics concerning structural and magnetic properties of adsorbates on thin metal films. The first one is the adsorption geometry of SO2 on a 1-monolayer (ML) Pd thin film grown on a Ni() single crystal.

X-Ray absorption spectroscopy (XAFS) is an attractive in situ and in operando technique. In recent years, the more conventional extended X-ray absorption fine structure (EXAFS) data analysis technique has been complemented by two newer analysis methods: the ‘atomic’ XAFS (AXAFS) technique, which analyzes the scattering from the absorber atom itself, and the Δμ XANES technique.

A discussion is given of a new class of methods to ascertain the configuration of adsorbates on surfaces. This class uses the extended x‐ray‐absorption fine‐structure (EXAFS) effect, which can be. Adsorption and surface chemical reactions of SO2 on Ni, Cu and Pd metal surfaces are studied by using surface XAFS, as well as XPS and STM.

It has turned out that SO2 lies flat on the Ni(), Ni.The Structures of CO, NO and Benzene on Various Transition Metal Surfaces: Overview of LEED and HREELS Results H.

Ohtani, M. A. Van Have, G. A. Somorjai Pages SEXAFS and NISXW studies of adsorbates on transition metal surfaces. By N Prince. Abstract. SEXAFS - Surface Extended X Ray Absorption Fine Structure; NISXW - Normal Incidence Standing X Ray WavesAvailable from British Library Document Supply Centre- DSC:D / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo.