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 50 for “"Secondary ion mass spectrometry (SIMS)"”.
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Photolytic Laser-Induced Chemical Vapor Deposition for Aluminum Film Growth
The mechanisms of UV photodissociation of trimethylaluminum (TMA) and triethylaluminum (TEA) by a KrF (248 nm) pulsed excimer laser were investigated using optical emission spectroscopy, including time-resolved emission measurements. Position-resolved growth rate measurements were used to …
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Native Oxides on Aluminum-Bearing Iii-V Semiconductors With Applications to High-Performance Laser Diodes
In these experiments, water vapor oxidation of Al-bearing III-V semiconductors is employed to form high quality native oxides. The oxides are examined using secondary ion mass spectrometry (SIMS) and transmission electron microscopy (TEM). The effect of the semiconductor composition and …
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Design of multi-channel spectrometers for scanning ion/electron microscopes
… of multi-channel analysers over conventional sequential detection are well known and are active areas of research both for electron energy spectroscopy and ion mass spectroscopy. Their inherent advantage of capturing the entire spectrum in parallel, promises at least an order of …
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Radiation enhanced diffusion of neodymium in single crystal thin film UO2
Radiation-enhanced diffusion (RED) of a Nd buried tracer layer in UO2 thin films was measured with Secondary Ion Mass Spectrometry (SIMS). Samples were irradiated with 1.8 MeV Kr+ over a temperature range from 400 to 800 C. RED in UO2 was found to be in the recombination limited regime. Dose rate …
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Growth and Characterization of Carbon-Doped Aluminum(x) Gallium(1-X) Arsenide and Aluminum(x) Gallium(1-X) Phosphide
… x}$Ga$\sb{\rm 1-x}$As with carbon concentrations ranging from 2 $\times$ 10$\sp $ cm$\sp{-3}$ to 3 $\times$ 10$\sp{20}$ cm$\sp{-3}$ have been characterized with Hall effect measurements, secondary ion mass spectrometry (SIMS), double crystal x-ray diffraction and nuclear reaction analysis in …
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Boron and phosphorous implantation into (100) germanium : modeling and investigation of dopant annealing behavior
… metal oxide semiconductor (CMOS) device application. Germanium implantation will be a critical process for future device fabrication. However, critical properties like Pearson parameters and dopant activation temperatures are not well established. In this study, boron and phosphorus were …
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Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes
This thesis analyzes compositions of seafloor massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and chemistry). Chapter 2 investigates the morphology, mineralogy, and geochemistry …
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Water and fluorine contents in Mt. Hood magmas recorded by plagioclase phenocrysts
… Hirth and Kohlstedt 1996), and volcanic eruption dynamics (Roggensack et al. 1997; Cashman 2004). H2O is the most well-studied volatile component of magmas, but other volatiles species (e.g. F) are the subject of increasing interest (Dasgupta and Dixon 2009). Magmatic volatiles are often …
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Solid solubility of silver in the superconducting YBa₂Cu₃O compound
… were prepared and characterized by X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), wavelength dispersive X-ray spectroscopy (WDX), and secondary ion mass spectrometry (SIMS). The lattice parameters were precisely …
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Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes
This thesis analyzes compositions of seafloor massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and chemistry). Chapter 2 investigates the morphology, mineralogy, and geochemistry …
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An investigation into dry and wet textile friction and lubrication in practical applications.
The lubrication of dry viscose fibres by a two component finish, and the lubrication of wet Iyocell fabric against metal, with various aqueous lubricant systems, has been studied. Secondary ion mass spectrometry (SIMS) was investigated as a means of providing direct chemical information from …
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Laser Annealing of Ion Implanted Silicon
… detailed theoretical and experimental investigation of the dynamics of surface melting and regrowth and electrical activation of Si('+) and BF(,2)('+) ion implanted amorphized silicon annealed with a Q-switched Nd:glass laser ((lamda)= 1.06 (mu)m). In the theoretical calculations we have used the …
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Durability of glass and ceramic fibres within the lung.
… for durability.Materials were exposed to simulations of the lung environment, which included a) exposure to Gamble's fluid, water, serum and other simulated fluids, b) long-term exposure to the intra-macrophage environment and c) exposure to rat lung. Durability was characterised by scanning …
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Diffusion and Electrical Properties of Sulfur Implanted in Gallium-Arsenide
The diffusion and electrical properties of implanted sulfur in GaAs have been investigated with secondary ion mass spectrometry (SIMS) and differential resistivity and Hall measurements. Low dose (7 x 10('12) cm('-2), 250 keV) S implants exhibit redistribution behavior upon annealing which …
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Trace Level Impurity Quantitation and the Reduction of Calibration Uncertainty for Secondary Ion Mass Spectrometry Analysis of Niobium Superconducting Radio Frequency Materials
… nature of the discovery led to additional research to fundamentally understand the physics behind the increase in cavity performance. This knowledge gap is bridged by materials characterization. Secondary ion mass spectrometry (SIMS) is a characterization technique which has become a …
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Long Chain Molecules in the Molten State: Surface Adsorption, Near Surface Structure, and Mutual-Diffusion
<p>The surface segregation in a binary mixture of polymer due to surface energy difference or end-grafting is studied. The surface energy difference induced segregation is compared with the mean-field theory. The end-labeling of chains strengthens the ability of the chain to bind to the surface, …
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Applying secondary ion mass spectrometry to cellular and model membranes to image component distribution and quantify composition
Abstract Secondary ion mass spectrometry (SIMS) returns chemically specific data on membrane component distribution and composition. Of particular interest is a membrane protein’s lipid environment, which may play a role in the protein’s function. Herein, this thesis describes the synthesis of …
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A Fundamental Study on the Relocation, Uptake, and Distribution of the Cs⁺ Primary Ion Beam During the Secondary Ion Mass Spectrometry Analysis
Combining cesium (Cs) bombardment with positive secondary molecular ion detection (MCs+) can extend the analysis capability of Secondary Ion Mass Spectrometry (SIMS) from the dilute limit (<1%) to matrix elements. The MCs+ technique has had great success in quantifying the sample composition of …
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Surface analysis of sodium oleate coated poly (ethylene terephthalate) films
… surface properties resulting in improved adhesion and wettability. The objective of the present work was to demonstrate the applicability of surface-sensitive techniques in the analysis of polymer films coated with thin overlayers. The surface or interphase region of sodium oleate coated …
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Surface mapping based on the correlated emission of ions and electrons from hypervelocity C60 impacts
High resolution mapping of molecular species, specifically sub-micrometer spatial resolution mapping, is at the forefront of recent interest in Secondary Ion Mass Spectrometry (SIMS). Large projectiles, e.g. C60, Au400, display high quasi-molecular ion yields with reduced fragment ion yields …
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