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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Chemisorption of Aromatic Compounds on Well-Defined Palladium Surfaces: Studies by Electron Spectroscopy and Electrochemistry

Li, Ding 2010 August 1900 (has links)
The chemisorption of aromatic compounds, derivatized with different functional groups, on well-defined Pd(111) surfaces was studied by a combination of Auger electron spectroscopy (AES), low energy electron diffraction (LEED), high resolution electron energy loss spectroscopy (HREELS), and electrochemistry (EC). The results of this work led to the following trends and conclusions: (a) At low concentrations, 2,5-dihydroxythiophenol (DHT) chemisorbs on a Pd surface through both diphenolic ring and thiol group. At high concentrations, it chemisorbs only through the thiol group. (b) There is extensive intermolecular attraction between the co-adsorbed thiolated quinone and thiolated hydroquinone molecules. The interaction occurs through the Pd substrate and not through space. (c) The chemisorption properties of Nheteroaromatic compounds are pH-dependent. When the nitrogen heteroatom is protonated, it becomes very weakly surface-active. When the nitrogen heteroatom is deprotonated, surface activity stronger than the diphenolic ring is exhibited. (d) On a palladium surface, the binding strengths of ligands increase in the order: phenyl ring < quinonoid ring, < N-heteroatom < I < -SH.
52

Temperature, photon energy and thickness dependent studies of Cs 5p core-levels on Cu(100), development of photoemission equipment and the 6m-TGM at CAMD /

Koch, Kevin David, January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references (leaves 225-235). Available also in a digital version from Dissertation Abstracts.
53

Defect studies of single crystal and thin film zinc oxide by positron annihilation spectroscopy and cathodoluminescence

To, Chun-kit., 杜俊傑. January 2010 (has links)
published_or_final_version / Physics / Master / Master of Philosophy
54

Quantum state resolved studies of copper-H₂ system and electronic spectroscopy of Cu(100)

Uka, Arban 23 March 2011 (has links)
Hydrogen quantum state resolved energy losses upon scattering from copper are studied using molecular beam techniques and quantum state-specific detection methods. Also clean copper and hydrogen and oxygen covered copper surfaces were studied using electron spectroscopy. There are many questions about the nature of molecule-surface dynamics and the processes. The relative role of the different degrees of freedom in the reaction and the importance of non-adiabatic effects have been two of these questions. These two questions motivated this work. Energy loss in the elastic scattering of H₂(v=1. J=1) and H₂(v=0, J=1) molecular quantum states is measured as a function of incident translational energy at two surface temperatures. The energy loss process is shown to agree to the Baule classical model for energy ranges 74-150 meV for the excited vibrationally state and 74-125 for the ground vibrational state. Results suggest that translational energy is more effective that vibrational energy in the observed process. Theoretical models have been able to explain several processes using nonadiabatic models where friction coefficient tensor is included. Results in this thesis suggest that the energy loss in the elastic scattering is a nonadiabatic one. Electron spectroscopy studies showed that the surface plasmon intensity is very sensitive to surface contamination. Using this property, surface-only sensitive virtual temperature programmed desorption (VTPD) is developed. A better understanding of unique behavior of hydrogen covered Cu(100) was gained. / text
55

Comparing cluster and slab model geometries from density functional theory calculations of si(100)-2x1 surfaces using low-energy electron diffraction

Dogbe, John Kofi. January 2007 (has links)
Thesis (Ph. D.)--University of Nevada, Reno, 2007. / "May, 2007." Includes bibliographical references. Online version available on the World Wide Web.
56

Construction of the preparation, growth and characterization chamber of molecular beam epitaxy system and some studies of the iron-gallium nitride system with a view to spintronics applications

Hui, I Pui. January 2007 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2007. / Also available in print.
57

Positron studies of silicon and germanium nanocrystals embedded in silicon dioxide

Deng, Xin, January 2009 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2009. / Includes bibliographical references (leaves 91-92) Also available in print.
58

Spectra of NH₃ at 2.5 [mu]m and some electronic bands of CO+ and NCO /

Misra, Prabhakar January 1986 (has links)
No description available.
59

Spectral momentum densities of crystalline graphite and ion sputtered amorphous carbon films from (e,2e) spectrology

Gao, Chao January 1988 (has links)
Ph. D.
60

Surface morphology and electronic structure of methyl-terminated alkanethiol self-assembled monolayers and solid water films

Lyagusha, Alina 04 September 2013 (has links)
This thesis is an investigation of surface morphology and electronic structure of self-assembled monolayers (SAMs) and solid water films deposited on these SAMs using metastable impact electron spectroscopy (MIES) and infrared reflection-absorption spectroscopy (IRRAS). MIES uses electronically excited slow helium atoms which interact exclusively with the outermost surface layer. The results suggested that in the SAMs containing an odd number of carbon atoms the molecular orbitals localized on the terminal methyl groups are more exposed at the surface compared to those with an even number of carbon atoms. It was also established that solid water films are more uniform on a SAM substrate containing an odd number of carbon atoms. Thermal transformation of amorphous solid water to polycrystalline ice was also observed. MIES suggested that the molecular orbital of water attributed to the lone pair on the oxygen atom became less accessible at the surface upon the transformation.

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