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Full-Text Articles in Physical Sciences and Mathematics
Analysis Of Reflected Spectral Signatures And Detection Of Geophysical Disturbance Using Hyperspectral Imagery, Forrest Mccoy Hoffman
Analysis Of Reflected Spectral Signatures And Detection Of Geophysical Disturbance Using Hyperspectral Imagery, Forrest Mccoy Hoffman
Masters Theses
Geophysical disturbances resulting from human activities often have significant
consequences for plants and animals, and even for entire ecosystems.Disturbances resulting from petroleum exploration and production activities can have long term impacts on soils, watersheds, rivers and lakes, vegetation, wildlife, and humans. These anthropogenic disturbances are frequently the result of hydrocarbon (oil) or produced water (brine) spills. Brine is usually produced simultaneously with oil or gas. The ability to detect brine spills with remote sensing techniques would be valuable to petroleum companies and industry regulators. The objectives of this research were to 1) determine if brine spills could be detected spectroscopically, …
Understanding The Dynamics Of Molecular Solids, Roman Wesolowski
Understanding The Dynamics Of Molecular Solids, Roman Wesolowski
Masters Theses
Superconductors, single-molecule magnets, and spin-ladders materials are at the center of interest in condensed matter science. All of these materials have incredibly important potential applications and their exploration is the key to the future technologies. We carried out various measurements on representative compounds of each group of interest. The main tool for all these projects was optical spectroscopy, varied in each case to apply magnetic field or change temperature. In our magneto-optical measurements of κ-(ET)2Cu[N(CN)2]Br and κ-(ET)2Cu[N(CN)2]Cl, we sought to understand correlations between intramolecular vibrations and superconductivity. We found several …
Low Energy Excitations In Spin Clusters And Molecular Solids, Jason Thomas Haraldsen
Low Energy Excitations In Spin Clusters And Molecular Solids, Jason Thomas Haraldsen
Masters Theses
This thesis investigates low energy magnetic and vibrational excitations in molecular solids. Analytical and numerical studies of these two types of excitations, both in idealized systems and in more complicated models that are thought to capture the relevant physics of several materials. The materials considered include molecular magnets and layered organic superconductors and semiconductors. Our results include exact expressions for certain magnetic observables, neutron scattering structure factors for small spin 1/2 clusters, studies of the molecular dynamics of Fe8Br8 molecular magnet, the e®ects of symmetry breaking in (DT-TTF)2Au(mnt)2 spin ladder candidate, and the importance …
Spectroscopy Using Short-Path Surface Plasmon Dispersion, Philip Ryan Boudreaux
Spectroscopy Using Short-Path Surface Plasmon Dispersion, Philip Ryan Boudreaux
Masters Theses
A miniature surface-plasmon based spectrometer is presented for both the near zone and the far zone. In the near zone four different experiments have been completed with this system. It will be shown that with 632, 614, 543, and 440 nm incident lasers upon the system there is good agreement between experimental and theoretical transmission spectra. This system is shown to provide transmission spectra of different broad band-pass, glass filters across the visible wavelength range with high stray-light rejection at low resolution. These spectra are compared to those taken with a commercial spectrophotometer. Spectra of solutions of the laser dye …
Resonant And Non-Resonant Inelastic X-Ray Scattering Of Copper Phthalocyanine, Michelle Deleene Tuel-Benckendorf
Resonant And Non-Resonant Inelastic X-Ray Scattering Of Copper Phthalocyanine, Michelle Deleene Tuel-Benckendorf
Masters Theses
With the ever-changing demands of technology and the desire to use new materials to replace the old, researchers have the job to not only find alternative materials, but also understand their properties. There continues to be extensive research in the properties of organic semiconductors, for use in many microelectronic applications. There is very little known about the excitation properties of these materials. For my research, I have chosen to study the electronic excitations of copper phthalocyanine (CuPc), one specific organic semiconductor. To do this, we used resonant and non-resonant inelastic x-ray scattering to measure the evolution of excitations as a …