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 89 for “"electron energy loss"”.
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Electron energy loss spectroscopy of transition-metal carbides
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T14:57:08Z No. of bitstreams: 1 1983_allison.pdf: 3824629 bytes, checksum: c0a995c7c2bcca1cad4a44e6d628a004 (MD5)
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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
… incompressible self-oscillation of conducting electrons in small nanoparticles. A classical spring model could be used to describe plasmon’s behavior. Many different techniques have been applied to understand nanostructure’s plasmonic properties. Electron energy loss spectroscopy (EELS) is one …
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Applications of computer algebra to the theory of electron energy loss
… interface plasmons and for the angle-resolved energy-loss function. The energyloss spectrum is then obtained by integrating over wavevectors. The formulas we have derived are applied to real materials such as Al/Mg, Al/Al<sub>2</sub>O<sub>3</sub>, Al/SiO<sub>2</sub>/Si, diamond and graphite.
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Mapping plasmon excitations in gold nanostructures using electron energy loss spectroscopy
… and fabricated Au nanostructures using an electron beam as a source of excitation. The motivation for the this work comes from the applications of these nanostructures and the need to understand the physics behind them. We introduce the concept of plasmonics in chapter 1 where we describe …
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Collective excitations in layered materials with momentum-resolved electron energy loss spectroscopy
… dielectric function). The measurement of the energy- and momentum-resolved chi(q,w) over a large phase space of q and w, however, presents a significant experimental challenge. Traditional methods to measure chi(q,w) have suffered from either one or more major drawbacks. To address this …
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Applications of electron energy loss spectroscopies to the study of surface chemistry
Two different kinds of electron energy loss spectroscopies have been used in this thesis to the study of surface chemistry. In the first part of the thesis which includes the first four chapters, Extended Electron Energy Loss Fine Structure (EXELFS) has been used to study the bonding of (1) oxygen …
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A study of oxide superconductors by electron energy loss spectroscopy in STEM.
… to be observed. By using a Scanning Transmission Electron Microscope (STEM) to study the fluctuations in stoichiometry, the sub-nanometre probe (-0.5nm) allows spatial resolution on the nanometre scale. Coupling the nanometre spatial resolution with electron energy loss spectroscopy (EELS), which …
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Electronic collective modes in two dilute conductors with momentum-resolved electron energy-loss spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Characterization of collective phenomena in cuprate superconductors by momentum-resolved electron energy loss spectroscopy
… exists a wide variety of strongly correlated electronic materials, including high temperature superconductors, exotic topological insulators, and charge density wave materials, that exhibit emergent behavior that cannot be understood through current theories of metals and insulators. These …
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Collective modes in strongly correlated electron systems measured with momentum-resolved electron energy-loss spectroscopy
"Strongly correlated electron systems comprise an exciting area of research in condensed matter physics due to the variety of quantum phenomena that results from the strong interactions between the electrons. Strongly correlated materials can be described in terms of weakly interacting, emergent …
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Linear-Scaling Density Functional Theory and Theoretical Electron Energy Loss Spectroscopy Investigations of Surfaces and Defects in Nanomaterials
… work presents a method for the computation of electron energy loss spectra for large systems using the onetep code. The foundations of density functional theory will be discussed, with a focus on the linear scaling methods employed by onetep. A method for the prediction of spectra will be …
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Investigation of the optical properties of Bi₂Sr₂Ca<sub>n-1</sub>Cu<sub>n</sub>O<sub>y</sub> (n=1,2) by transmission electron energy loss spectroscopy
A high energy resolution transmission electron energy loss spectrometer was reassembled for this research project. The vacuum system, electron optical lenses, electronic control elements, and high voltage system were reconditioned. A CAMAC interface system was installed into the spectrometer, and a …
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Microstructure and Microchemistry of Titanium-Carbide Coated Cemented Carbides
… contemporary micro-analytical techniques: Auger Electron Spectroscopy, STEM X-ray microchemical analysis and electron energy loss spectroscopy. As most of the analytical technique
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Surface decomposition studies of trimethylgallium on silicon(100)
… fundamentally and industrially important in microelectronics processing. In this study, the decomposition of trimethylgallium (TMG) on silicon (100) was investigated using thermal desorption spectroscopy (TDS), x-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), and electron energy …
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The influence of microstructure on the mechanical properties of some refractory compounds
A brief review of the basic physics of electron energy loss spectroscopy and extended x-ray absorption fine structure spectoscopy is presented in the context of their application to the study of the microstructure of transition metal carbides and diborides. The local atomic structure of amorphous …
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A Study of Fuel Conversion Chemistry
… has been determined to be 907 +/- 4 kJ/mol using electron energy loss spectroscopy.
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Search for evidence of fermi surface nesting in Bi₂Sr₂Ca₁Cu₂O₈
The electron energy loss spectrometer at Virginia Tech has been modified with new momentum deflectors and various other hardware improvements. In addition to some hardware changes all the software to run the spectrometer and analyze the data has been rewritten. It was suggested by Tsuei (1990) that …
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Probing nano-scale atomic and electronic structures of iron-based superconductors
… in these materials. Investigating atomic and electronic structures is thus essential to help understand their interesting properties. In this thesis, I have investigated the bulk and thin-film form of iron-based superconductors by using a combination of scanning transmission electron …
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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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Chemical vapor deposition of copper, copper(I) oxide, and silver from metal-organic precursors
… byproducts generated during the deposition, electron energy loss spectroscopy, and temperature programmed desorption experiments indicate that copper(I) oxide is formed by an elimination mechanism and copper metal is formed by deoxygenation of an initially deposited copper(I) oxide phase.
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