THE APPLICATION OF HIGH RESOLUTION ELECTRON ENERGY LOSS SPECTROSCOPY TO THE CHARACTERIZATION OF ADSORBED MOLECULES ON RHODIUM SINGLE CRYSTAL SURFACES. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
The scattering of low energy electrons by metal surfaces has been studied for many years now. The electron's ease of generation and detection and high surface sensitivity (low penetration depth) make it an ideal probe for surface scientists. The impinging electron can interact with the surface in basically two ways: it can either elastically reflect (or diffract) from the surface without losing energy or lose a portion of it's incident energy and inelastically scatter. In this paper we will be concerned with only one of many possible inelastic scattering processes: the loss of the electron's energy to the vibrational modes of atoms and molecules chemisorbed on the surface. This technique is known as high resolution electron energy loss spectroscopy (or ELS, EELS, HRELS, HREELS, etc.).
Author: Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
The scattering of low energy electrons by metal surfaces has been studied for many years now. The electron's ease of generation and detection and high surface sensitivity (low penetration depth) make it an ideal probe for surface scientists. The impinging electron can interact with the surface in basically two ways: it can either elastically reflect (or diffract) from the surface without losing energy or lose a portion of it's incident energy and inelastically scatter. In this paper we will be concerned with only one of many possible inelastic scattering processes: the loss of the electron's energy to the vibrational modes of atoms and molecules chemisorbed on the surface. This technique is known as high resolution electron energy loss spectroscopy (or ELS, EELS, HRELS, HREELS, etc.).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Two techniques which have made important contributions to the understanding of surface phenomena are high resolution electron energy loss spectroscopy (EELS) and photoelectron diffraction (PD). EELS is capable of directly measuring the vibrational modes of clean and adsorbate covered metal surfaces. In this work, the design, construction, and performance of a new EELS spectrometer are described. These results are discussed in terms of possible structures of the O-Cu(001) system. Recommendations for improvements in this EELS spectrometer and guidelines for future spectrometers are given. PD experiments provide accurate quantitative information about the geometry of atoms and molecules adsorbed on metal surfaces. The technique has advantages when used to study disordered overlayers, molecular overlayers, multiple site systems, and adsorbates which are weak electron scatterers. Four experiments were carried out which exploit these advantages.
Author: John C. Hemminger Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
This paper involved the use of the experimental techniques thermal desorption spectroscopy (TDS), high resolution electron energy loss spectroscopy (HREELS) and low energy electron diffraction (LEED) and theoretical developments in the analysis of adsorbate vibrations to study the chemistry of a wide range of nitrogen containing hydrocarbons on transition metal surfaces. Fifteen technical reports resulted from the research. Keywords: Cyanogen, Transition metals, Vibrations of Adsorbates, Surface defects.
Author: Keiichiro Fuwa Publisher: Elsevier ISBN: 1483280225 Category : Science Languages : en Pages : 337
Book Description
Recent Advances in Analytical Spectroscopy covers the joint meeting of the Ninth International Conference on Atomic Spectroscopy and the 22nd Colloquium Spectroscopicum Internationale, held at the New Otani Hotel and Sophia University, Tokyo, Japan, on September4-8, 1981. The joint meeting features 446 including 74 invited lectures and 39 poster sessions. This book is divided into 26 chapters, which reflect the analytical spectroscopic topics covered in 20 sessions, including plasma emission spectrometry, DC arc, spark and other emission spectrometry, and hydride generation technique for atomic spectrometry. Other chapters deal with furnace atomic absorption spectrometry, Zeeman atomic absorption spectrometry, atomic spectrometric detection systems for separation analysis, atomic fluorescence and scattering spectroscopy, flame atomic absorption spectrometry, spectroscopy for chemical state analysis, spectroscopy for surface and interface analysis. The remaining chapters discuss the application of computers in analytical spectroscopy, developments in laser spectroscopy, application to life science, environmental and geochemical applications, X-ray analysis, UV-VIS spectroscopy, IR and Raman spectroscopy, magnetic resonance spectroscopy, mass spectrometry, and photoacoustic spectrometry. This book will be of value to analytical chemists and related scientists and researchers.
Author: Anatoli Davydov Publisher: John Wiley & Sons ISBN: Category : Science Languages : en Pages : 706
Book Description
As in the study of transition metal complexes in solution, molecular spectroscopic methods - principally the infrared, ultraviolet/visible and electron spin resonance spectroscopies - have played key roles in establishing the concepts of coordination chemistry occurring at the surfaces of solids. This book describes the development of the principals of coordination chemistry of oxide surfaces using analyses of data obtained by these methods. The nature, properties, concentration of the surface adsorption centers and their influence on the character of interaction with different molecules are investigated. The book commences with an account of the basic theoretical principles and experimental techniques of the various spectroscopy methods, with special attention devoted to in situ measurements where the oxide or catalyst sample is in contact with the adsorbate or the reactant. A detailed account is presented of the methods for characterizing the oxidation state and degree of coordination of surface cations and oxygen anions by the adsorption of probe molecules. The complexation of many inorganic, organometallic and organic molecules with different oxide systems is critically examined, and a classification of formed surface compounds, based on the interaction with definite type of adsorption centers, is given. Possible mechanisms of numerous catalytic reactions, including the transformation of organic molecules over acidic catalysts via the carboionic mechanism, are discussed using the spectroscopic identifications of reaction intermediates. A comprehensive analysis of the literature on the interpretation of the spectra of surface compounds on oxides is presented. This highly illustrated and extensively referenced volume is intended for specialists working in the fields of surface physical chemistry, surface and materials sciences, and adsorption phenomena and is essential reading for those involved in the heterogeneous catalysis by transition metal-oxides.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 1390
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Author: Lawrence Henry Dubois
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Author: Alexis T. Bell
Author: John C. Hemminger
Author: Keiichiro Fuwa
Author: Anatoli Davydov
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