High-resolution and Time-resolved Electron Energy Loss Spectroscopy Studies of Adsorbate Bonding and Reactivity PDF Download

Author: Lee James Richter
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 964

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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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: Bruce Alvin Gurney
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 820

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Book Description

Author: H. Ibach
Publisher: Academic Press
ISBN: 1483259455
Category : Science
Languages : en
Pages : 379

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Electron Energy Loss Spectroscopy and Surface Vibrations is devoted to electron energy loss spectroscopy as a probe of the crystal surface. Electrons with energy in the range of a few electron volts sample only a few atomic layers. As they approach or exit from the crystal, they interact with the vibrational modes of the crystal surface, or possibly with other elementary excitations localized there. The energy spectrum of electrons back-reflected from the surface is thus a rich source of information on its dynamics. The book opens with a detailed analysis of the physics that controls the operation of the monochromator, which is the core of the experimental apparatus. Separate chapters follow on the interaction of electrons with vibrational modes of the surface region and with other elementary excitations in the vicinity; the lattice dynamics of clean and adsorbate-covered surfaces, with emphasis on those features of particular relevance to surface vibrational spectroscopy; and selected applications vibration spectroscopy in surface physics and chemistry.

Author: John C. Hemminger
Publisher:
ISBN:
Category :
Languages : en
Pages : 7

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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: J. L. Erskine
Publisher:
ISBN:
Category :
Languages : en
Pages : 14

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The objective of this research program is to utilize high resolution electron energy loss spectroscopy and other spectroscopic tools to investigate chemical and physical properties of surfaces and of gas-surface interactions. Our experiments address issues pertaining to bond lengths and site symmetry of chemisorbed atoms and molecules at metal surfaces, binding energies and vibrational frequencies associated with the atomic and molecular bonds, and with the driving mechanisms responsible for structural transformations which occur at surfaces as a result of chemisorption or other perturbations such as temperature change. Our work also addresses possible improvements in experimental techniques and data analysis which offer expanded applications. Research accomplishments of the program include a significant advancement in instrumentation, the first measurements of shear horizontal vibrational modes at crystal surfaces, the first detection of projected bulk phonon modes by surface electron scattering and elucidation of novel properties associated with hydrogen interaction at Niobium surfaces. Keywords: Surface chemistry, Structure and electronic properties of surfaces, Electron scattering, Physical chemistry, Shear properties, Scattering. (jg).

Author: Joseph Anthony Stroscio
Publisher:
ISBN:
Category : Electron energy loss spectroscopy
Languages : en
Pages : 1202

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Author: Judith A. Gates
Publisher:
ISBN:
Category : Electron energy loss spectroscopy
Languages : en
Pages : 330

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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 918

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Author: Mark Michael Disko
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Electron energy loss spectroscopy
Languages : en
Pages : 292

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Book Description
This volume of conference proceedings characterizes the microstructure of materials ranging from polymers to superconductors. Electron energy loss spectrometry is a recent addition to the group of diffraction, imaging and spectroscopic techniques available for the study of materials by transmission electron microscope. The book is intended for the use of materials scientists who are looking for a combination of analytical tools and problem-solving approaches.