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Full-Text Articles in Physics

Elucidation Of Ultrafast Photophysics With Optical Pulse Shaping, Erik Martin Grumstrup Jan 2011

Elucidation Of Ultrafast Photophysics With Optical Pulse Shaping, Erik Martin Grumstrup

Physics Graduate Theses & Dissertations

Optical pulse shaping is an incisive tool of laser spectroscopy that allows the experimentalist extensive flexibility to manipulate the electric field of an excitation laser pulse. In this thesis, four applications of optical pulse shaping are examined. In Chapter 2, a partially non-collinear implementation of two-dimensional electronic spectroscopy is demonstrated for the first time on rubidium vapor. The use of a pulse shaper in this context is advantageous as it significantly reduces the complexity of the experimental apparatus. Unfortunately, non-ideal pulse shaping due to pixelation effects in some pulse-shaping devices leads to spurious pulse generation when the spatial masks become ...


Electronic Photodissociation Spectroscopy Of Electrosprayed Anions, Jesse Cohen Marcum Jan 2011

Electronic Photodissociation Spectroscopy Of Electrosprayed Anions, Jesse Cohen Marcum

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

Ionic compounds are ubiquitous and play central roles in a variety of chemical, physical, and biological processes. Due to the incredible complexity of many of these processes, it is advantageous to develop a detailed molecular-level description of ions as isolated species. This approach provides the ability to study the intrinsic properties of ions in the absence of perturbing effects from solvent and/or counterions. Additionally, such studies can be used to perform experiments on model systems in which ions serve as “molecular laboratories” for developing new insight to fundamental physical and chemical phenomena.

This thesis is comprised of work I ...


Thermochemical Conversion Of Biomass: A Molecular Viewpoint, Angayle Konstance Vasiliou Jan 2011

Thermochemical Conversion Of Biomass: A Molecular Viewpoint, Angayle Konstance Vasiliou

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

This dissertation describes experiments performed to study the thermal decomposition of biomass from a molecular viewpoint. The structure of biomass consists of three major parts: cellulose, hemicellulose and lignin. Thermochemical conversion of biomass, specifically pyrolysis and gasification, yields a complex mixture of light gases, condensable vapors and aromatic tars. The goal for the gasification of biomass is to maximize the production of syngas (CO and H2 ) and minimize the production of aromatic tars. This thesis provides thermochemical information particularly related to cellulose decomposition.

The current technology for the conversion of biomass to biofuels is hindered by the lack of fundamental ...


Photoelectron Spectroscopy Of Nitroalkane Anions, Christopher Lynn Adams Jan 2011

Photoelectron Spectroscopy Of Nitroalkane Anions, Christopher Lynn Adams

Physics Graduate Theses & Dissertations

This thesis describes research on the electronic properties of nitroalkane anions, CH3(CH2)nNO2 (where n=0,1,2, and 3), using a newly built velocity-map imaging photoelectron spectrometer. The nitroalkanes are an intriguing class of molecules that possess many similarities owing to the dominating presence of the nitro group. They all possess relatively low adiabatic electron affinities, large dipole moments, and undergo similar distortions (largely localized within the nitro group) upon electron attachment. The focus of the studies presented in this thesis is quantitatively characterizing the anion and neutral states, determining fundamental molecular properties (i ...