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 13 of 13 for “"transition dipole moment"”.
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Steady-State and Ultrafast Fluorescence Depolarisation in Rigid-Rod Conjugated Polymers
… difference between the absorption and emission transition dipole moments of a molecule. Polarised spectroscopy results from a polymer with a flexible backbone, poly (9,9-di(ethylhexyl)fluorene) were compared with those from two rigid backbone polymers: methyl-substituted ladder-type poly …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
… the absorber which can saturate molecular transitions. The Lamb dips in the spectra, due to saturation, can be fit with high precision, and the use of an optical frequency comb as an accurate frequency reference allows transitions to be recorded with MHz/sub-MHz uncertainty. In many cases, …
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Molecular Spectroscopy: A Study of Molecules in Earth and Planetary Atmospheres
… J<sub>max</sub> =200 for the rotational levels. Dipole moment functions (DMFs) covering the range of the PES turning points were calculated for AlCl and AlF by <em>ab initio</em> methods and used to determine line intensities. Partition functions for temperatures up to 3000 K were calculated. AlF …
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Advanced Fluorescence Lifetime Imaging and Spectroscopy Techniques for Biological Samples
… and an advanced model by Toptygin et al. The transition dipole moment and the shape of the fluorophore can be analyzed using a model also by Toptygin et al. Time-resolved fluorescence imaging and spectroscopy offer a very powerful and versatile method for applications in the life sciences.
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Spectroscopic characterization and photochemistry of nitrogen-containing molecules relevant to Titan's atmosphere
… to be weak, due to the near cancellation of the transition dipole moment upon electronic excitation. The phenylcyanomethyl radical (PCM, Ph-ĊH-C≡N), a doubly resonance-stabilized radical (RSR), was also spectroscopically characterized for the first time. The ionization potential, excited state …
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Engineering the Synthesis and Properties of Two-Dimensional Colloidal Perovskite Nanoplatelets
… and dielectric-confinement, and anisotropic transition dipole moment orientation. This dissertation seeks to establish a robust synthetic protocol for the preparation of colloidal perovskite nanoplatelets and further engineer their desirable properties. First, I briefly review the history of …
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Surface-Enhanced Vibrational Spectroscopies using Electrodeposited Anisotropic Gold Nanoparticles
Electrodeposited anisotropic gold nanostructures with the morphology of daggers are produced from a plating solution of gold (III) salt and 4-methoxypyridine (MOP) on a thin film indium tin oxide (ITO) working electrode. The gold nano-daggers (AuND) were demonstrated to be suitable for …
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Excited state charge redistribution and dynamics of flavins, flavorproteins, and their cofactors
… redox state arises from two distinct electonic transitions in the visible/near-ultraviolet spectral range, a fact that has not been incorporated into the analysis of many ultrafast spectroscopic experiments of reduced anionic flavins/flavoproteins. The difference dipole moment of the second, …
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Quantum Chemical Studies for the Engineering of Metal Organic Materials
<p>Metal Organic Materials (MOM) are composed of transition metal ions as connectors and organic ligands as linkers. MOMs have been found to have high porosity, catalytic, and optical properties. Here we study the gas adsorption, color change, and non-linear optical properties of MOMs. These …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… and therefore control the isotropy of the transition dipole moment, I achieve the first demonstration of directly-generated linearly polarised electroluminescence (EL) from perovskite nanoplatelet systems. PbI2 precursors are used to passivate surface I-vacancies to reduce trap-assisted …
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Trend Analyses of the Abundances of Atmospheric Molecules
… the A<sup>3</sup>Π - X<sup>3</sup>Σ- electronic transition of NH has been prepared using line positions from the literature and calculated line intensities. High level <em>ab</em> <em>initio</em> calculations were performed with the MOLPRO program to obtain the A - X transition dipole moment …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… using two dimensional atomically thin transition metal dichalcogenides (TMDs). To realize efficient next generation optoelectronics using these materials it is crucial to understand the dynamics and transport of energy and charge in these materials and hybrid structures built from them. …
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Phase behavior of dipolar fluids and ion-dipole mixtures, and surface diffusion of adsorbed polymers
Dipole moments are ubiquitous in nature. Studying dipole moments is the first step toward understanding phase behavior of various colloids with strong dipole moments. Since the Dipolar Hard Sphere fluid (DHS) is the simplest model described by dipolar interactions, studying this model is …