Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"low energy electron diffraction (LEED)"”.
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An electrochemical and surface analytical investigation of iron oxidation, passivation and corrosion inhibition
… Ultrahigh vacuum surface analysis by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), thermal desorption mass spectrometry (TDMS) and ion bombardment (depth profiling) was used to investigate iron oxide films formed on iron by gas phase oxygen exposure as well as …
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Structure Sensitivity of Ethylene Adsorption on Platinum (Dehydrogenation)
… Temperature Programmed Desorption (TPD), Electron Energy Loss Spectroscopy (EELS), Low-Energy Electron Diffraction (LEED) and Auger spectroscopy are applied to study the adsorption of ethylene on the square (1 x 1)Pt(100) and on the pseudo-hexagonal (5 x 20)Pt(100). A model based on the …
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Segregation and Phase Dynamics in Supported Bimetallic Nanoparticles
… silane (SiH$\sb4)$ is described. Using Auger electron spectroscopy (AES), Si was found to readily diffuse into the Pt substrate and sequentially form at least two unique intermetallic Pt-Si surface structural phases with $(\surd7$ x $\surd7)R\pm19.1\sp\circ$ and $(\surd19$ x …
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Coadsorption of anions and ultra-thin metal films on single crystal electrodes
… The anion and metal coverages from the Auger electron spectroscopy (AES) measurements were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were …
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Surface studies of group IV-VI layered crystals
… structure of TiS2 has been investigated by low energy electron diffraction (LEED). No surface reconstruction was observed and comparison of LEED intensity data with theory suggests a slight outward relaxation of atomic planes at the surface. The LEED pattern for a crystal cleaved at a …
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Characterization and Reactivity of Mo₂C
… method, and then characterized using x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), CO chemisorption, and N₂ physisorption. The catalytic activity of the β-Mo₂C was tested for cumene hydrogenation under high pressure conditions, and the effect of sulfur and oxygen poisons …
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Besetzte und unbesetzte elektronische Struktur von geordneten Dünnschichtverbindungen der Seltenen Erden Eu und Yb mit den Übergangsmetallen Pd und Ni
… thesis deals with the occupied and unoccupied electronic states of intermetallic compounds of the rare-earth metals (RE) Eu and Yb with the transition metals Pd and Ni. The compounds were prepared in-situ as epitaxial thin films on single-crystalline substrates. For comparison, the experiments …
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Ordering of organic molecules on templated surfaces
… acid, (C6H3(COOH)3) organic molecules. The following techniques were used in this study; Scanning Tunnelling Microscopy (STM), Low Energy Electron Diffraction (LEED), Normal Incident X-Ray Standing Waves (NIXSW) and Temperature Programmed Desorption (TPD). The room temperature growth and …
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Interaction of Na, O₂, CO₂ and water on MnO(100): Modeling a complex mixed oxide system for thermochemical water splitting
… desirable because it directly converts thermal energy into stored chemical energy in the form of hydrogen and oxygen. Recently, the Davis group at Caltech reported an innovative low-temperature (max 850°C) catalytic cycle for thermochemical water splitting based on sodium and manganese oxides …
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CO oxidation on metal supported ultrathin oxide films
… und Zusammensetzung wurden anhand der "low energy electron diffraction" (LEED) und der Augerelektronenspektroskopie (AES) überprüft. Die Filmbedeckung sowie die verschiedenen Sauerstoffzustände wurden mittels temperatur-programmierter Desorption (TPD) unterschieden. Das katalytische …
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STM, LEED and photoemission studies of the Sn/Cu(100) surface alloys
… their single-metal counterparts. Since most microelectronic assemblies utilize Pb-Sn solders for interconnection and modern environmental regulations have targeted the elimination of Pb usage, this makes research for “Pb-free” solders an important issue for microelectronics assembly. Thus the …
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High-Temperature Corrosion of Aluminum Alloys: Oxide-Alloy Interactions and Sulfur Interface Chemistry
… aluminum alloys in the presence of sulfur. Auger electron spectroscopy (AES), low energy electron diffraction (LEED), and scanning tunneling microscopy (STM) studies were conducted under ultrahigh vacuum (UHV) conditions on oxidized sulfur-free and sulfur-modified Al/Fe and Ni3Al(111). Evaporative …
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Surface reactions of boron with clean tungsten substrates
… shown here to apply to a more general class of electron emission phenomena and a much broader range of adsorbates. This model predicts that chemically, vapor-deposited boron will increase the work function of a clean tungsten substrate at coverages between 0 and 1 monolayer. This is the first …
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Fast multipole acceleration of periodic Green's function using spherical harmonics and Ewald summation
… When expressed as a spatial sum, PGF converges slowly making this representation unsuitable for numerical implementation. An alternative representation known as Ewald summation can be used to evaluate PGF with exponential convergence and high accuracy. Despite the use of Ewald summation to …
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Assessing the Reactive Surface Area of Phlogopite during Acid Dissolution: An Atomic Force Microscopy, X-ray Photoelectron Spectroscopy, and Low Energy Electron Diffraction Study
… situ atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) in an attempt to characterize the reactive surface area during dissolution. Mica minerals are the ideal material for this study because they offer a high degree of structural …
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Initial surface reactions and nucleation kinetics of boron on atomically clean molybdenum substrates
… done with field emission microscopy (FEM) and low energy electron diffraction (LEED).</p> <p>A correlation of the efficiency by which BI<sub>3</sub> is effectively dissociated to form adsorbed boron, and the temperature of the substrate has been shown through work function measurements on the …
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Surface structures of Al-Pd-Mn and Al-Cu-Fe icosahedral quasicrystals
… (UHV), have been systematically studied by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). The set of four surfaces we have investigated, Al-Pd-Mn twofold, threefold, fivefold surfaces and Al-Cu-Fe fivefold surface, allows comparisons between different …
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The Structure and Composition of Metal Surfaces
Transmission electron microscopy (TEM) has become a valuable tool in the study of the structure and composition of metal surfaces, though its surface-sensitivity is known to be lower than that for reflection high energy electron diffraction (RHEED), low energy electron diffraction (LEED) and Auger …
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A Window into Selective Catalytic Reduction: a RAIRS Study of NO and NH3 on Cu{311}
… used in tandem to support the study, such as low energy electron diffraction (LEED) and temperature programmed desorption (TPD) experiments using mass spectrometry. The study was carried out in pursuit an understanding of the underlying mechanism of the selective catalytic reduction (SCR) of …
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Surface structure and composition determination by low-energy electron scattering and Monte Carlo simulations
… structural and compositional determination with low-energy electron scattering and Monte Carlo simulations. Low-energy electron diffraction (LEED) technique and the newly developed low-energy electron microscopy (LEEM) IV technique are used to measure the electron scattering intensity spectra and …
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