Browsing Physics (Theses and Dissertations) by Date of Publication
Now showing items 1-20 of 408
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CrO2 : a general study
(Trinity College (Dublin, Ireland). School of Physics, 2000)The aims of this work were (i) to prepare chromium dioxide, CrO2, in thin film and powder form (ii) to study its magnetic, electronic and thermal properties and (iii) to introduce thin films of CrO2 into a multilayer device ... -
Morphological influences on the excited state dynamics of conjugated polymers
(Trinity College (Dublin, Ireland). School of Physics, 2000)A series of soluble phenylene vinylene copolymers have been prepared by four different methods. Two of these methods use the Wittig reaction in toluene and DMF, whereas the other two were prepared by the Horner reaction ... -
New conjugated polymers : Synthesis, characterisation and applications
(Trinity College (Dublin, Ireland). School of Physics, 2000)A series of conjugated polymers related to poly (phenylenevinylene) have been synthesised and characterised. These polymers contain various substitution patterns. Octyloxy side-chains were attached to the arylene units of ... -
An electron paramagnetic resonance study of carbon based electronic materials
(Trinity College (Dublin, Ireland). School of Physics, 2000)Electron paramagnetic resonance (EPR) measurements have been made on films of hydrogenated amorphous carbon (a-C: H) and ion implanted 6H-SiC. We examine several sets of a-C: H films. The first and second sets of films ... -
Pulse formation and dynamics in self-pulsating semiconductor laser diodes
(Trinity College (Dublin, Ireland). School of Physics, 2000)Self-pulsating lasers emitting at 800 nm are used in compact disc (CD) players because their low coherence makes them relatively insensitive to optical feedback. The ever increasing demand for higher capacity storage on ... -
Polymeric waveguides for use as solid state laser materials
(Trinity College (Dublin, Ireland). School of Physics, 2000)The work presented is intended to identify promising candidate materials for use as solid state lasers utilising planar optical waveguides, and to gain an insight into the physical processes that may be controlled through ... -
Development and optimisation of optical interferometric techniques for surface metrology
(Trinity College (Dublin, Ireland). School of Physics, 2000)Optical surface metrology techniques offer many advantages over conventional methods. These include a greater sensitivity, improved lateral and vertical resolution, non-contact and full-field measurements and the fact that ... -
The weakly coupled chiral Schwinger model on a finite lattice
(Trinity College (Dublin, Ireland). School of Physics, 2000)The primary aim of this work is the development of a perturbative analysis of the phase structure of the lattice Schwinger model. A novel method for implementing this analysis is presented. It is shown analytically that ... -
Supersymmetric noether currents and Seiberg-Witten theory
(Trinity College (Dublin, Ireland). School of Physics, 2000)This thesis has been devoted to the construction of the Noether supercharges for the Seiberg-Witten (SW) model. One of our most important results is the first complete and direct derivation of the SW version of the ... -
Surface studies of magnetite (100)
(Trinity College (Dublin, Ireland). School of Physics, 2000)The (100) surface of magnetite (Fe3 O4 ) has been studied using scanning tunneling microscopy (STM) in ultra high vacuum (UHV) with a view to establishing a test surface for spin polarised STM experiments. Two ... -
Optimization techniques in elastic proton-proton collisions
(Trinity College (Dublin, Ireland). School of Physics, 2000)The proton spin puzzle has intrigued experimentalists and theorists since the surprising result from the EMC experiment at CERN in 1988, which found a smaller than expected contribution to the spin of the proton from the ... -
An X-ray search for active cores in Local Group galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2000)The nuclei of galaxies are sometimes sites of very energetic process, resulting in high levels of electromagnetic radiation being emitted. Such active galactic nuclei (AGNs) are thought to be powered by accretion of mass ... -
Curing of complex monomer systems: a spectroscopic and thermal analysis
(Trinity College (Dublin, Ireland). School of Physics, 2001)This thesis describcs the development of a novel methodology, which uses the high resolution liquid nuclear magnetic resonance (NMR) spectroscopic technique to continuously monitor in real time the thermal and UV-photoinitiated ... -
Surface studies of the Fe/Mo(110) and Fe/W(100) epitaxial systems
(Trinity College (Dublin, Ireland). School of Physics, 2001)This thesis describes the investigation of ultrathin Fe film growth on the Mo(110) and W(100) surfaces, using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and Auger electron spectroscopy ... -
Magnetic field effects on the electrodeposition and electrodissolution of copper
(Trinity College (Dublin, Ireland). School of Physics, 2001)The effect of a static magnetic field on the electrodeposition and electrodissolution of copper in acidified copper sulphate solution was investigated. The primary effect of the field was to increase the rate of mass ... -
Simulations of foams and liquid surfaces
(Trinity College (Dublin, Ireland). School of Physics, 2001)In this thesis, we combine physics and numerical methods to describe the basic properties of foams and liquid surfaces. In Part I, we provide a brief general introduction to the subject of foam physics, detailing what a ... -
Investigation of low voltage Fabry-Perot modulators for optical interconnect applications
(Trinity College (Dublin, Ireland). School of Physics, 2001)Optical interconnect technology is one of the proposed solutions to the fast approaching communication bottleneck in electronic digital systems, arising from the bandwidth limitations of electrical interconnects. Optical ... -
A miroscopic and spectroscopic characterisation of nanotube/conjugated polymer interactions
(Trinity College (Dublin, Ireland). School of Physics, 2001)A composite material of a conjugated polymer and carbon nanotubes has been developed. The conjugated polymer is poly (p-phenylenevinylene-co-2,5-dioctyloxy-m-phenylenevinylene) (PmPV), a polymer significant for its ... -
Localized basis approach to many-body effects and dielectric response
(Trinity College (Dublin, Ireland). School of Physics, 2001)This thesis is a study of the optical and dielectric properties of semiconductors and insulators, and of the way in which these properties provide insight into the microscopic response of the interacting system. The central ... -
Preparation, characterisation and technological applications of half-metallic ferromagnetic oxides in ceramic and thin film form
(Trinity College (Dublin, Ireland). School of Physics, 2001)The aims of this study were: (i) to study the structural, magnetic and transport properties of ferromagnetic oxides (La0.7 Sr0.3)MnO3 and A2FeMoO6 (A=Ca, Sr, Ba) in polycrystalline and thin film form, (ii) to optimise the ...
