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Full-Text Articles in Physics

Photoelectron Spectroscopy Of Organic Aromatic Anions, Daniel John Nelson Jan 2017

Photoelectron Spectroscopy Of Organic Aromatic Anions, Daniel John Nelson

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

Nelson, Daniel John (Ph.D. Chemical Physics)

Photoelectron Spectroscopy of Organic Aromatic Anions

Thesis directed by Professor W. Carl Lineberger

This dissertation reports and interprets the results of experiments in which photoelectron spectroscopy was performed on a variety of aromatic anions. In addition to these photoelectron studies, the results and conclusions of an experiment in which HCl is scattered off atomically flat Au (111) surfaces are also presented.

Photoelectron spectroscopy of the isomers of methylphenoxide reveals that these molecules display minimal vibrational excitation upon photodetachment, accessing the electronic ground and first excited state of the corresponding radicals. The photoelectron spectra ...


Design And Construction Of A 3d Velocity Map Imaging Spectrometer, Laura Wooldridge Jan 2017

Design And Construction Of A 3d Velocity Map Imaging Spectrometer, Laura Wooldridge

Undergraduate Honors Theses

Enormous insight can be gained into high energy molecular processes by ionizing a molecule and examining the energy release of the resulting ions and electrons. Time-of-flight spectroscopy is a simple and powerful technique for measuring the mass-to-charge ratio and initial energy of a particle by recording the time it takes to accelerate through a region. Velocity map imaging (VMI) is a newer technique that measures the kinetic energy and angular distributions of electrons and ions in the form of a 2D spatial image. VMI spectrometers can now be combined with time-of-flight techniques to extract the entire three-dimensional momentum distribution of ...


Elastic Interactions Between Optical And Topological Solitons In Chiral Nematic Liquid Crystal, Andy Seracuse Jan 2017

Elastic Interactions Between Optical And Topological Solitons In Chiral Nematic Liquid Crystal, Andy Seracuse

Undergraduate Honors Theses

The research presented in this thesis investigates the elastic director field interactions between optical, spatial solitons and defect structures in frustrated chiral nematic liquid crystals. I characterize experimentally the rich elastic interactions between torons, particle-like localized director field configurations with non-trivial topology, and spatial, optical solitons, which have been previously dubbed nematicons. By exploitation of the waveguide regime for the generation of stable thresholdless nematicons via the reorientational nonlinearity present in thermotropic liquid crystals, I characterize the elastic potential energy surrounding a stationary nematicon and a mobile toron via measurement of toron displacement as a function of time. I compare ...