Physics and Astronomy, Department of: Recent submissions
Now showing items 1-20 of 62
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Research Group Data Archive, 1985-2018
(2018-09)Included here are two parallel archives, one of raw spectral DATA and the other of spectral ANALYSIS. There is a small number of other spectra, such as of positron lifetimes, x-ray diffractograms, “DATA” contains raw ... -
Physics Matters, 2017-2018
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Solute-solute interactions in intermetallic compounds studied using perturbed angular correlation of gamma rays
(2017-05)Interactions between pairs of solute atoms dissolved in a binary intermetallic compound were studied. Perturbed angular correlation of gamma rays (PAC) was used to detect solute atoms next to impurity PAC probe atoms in ... -
Extending Miedema's Semi-Empirical Model to Predict Defect Site Preferences and Formation Enthalpies of Ordered Compounds
(2016-12)Miedema's Semi-Empirical Model is a method in which a simple calculation provides a rough estimate of the formation enthalpy of a single defect atom (of element X) surrounded completely by a solvent element (element A). ... -
A qualitative look at the thermodynamics of ternary phase diagrams
(2016-05)In 2014, Collins’ research group embarked on experiments using Perturbed Angular Correlation (PAC) spectroscopy to measure interactions between solute atoms in ternary alloys. PAC requires a probe atom, 111In, making the ... -
Helically-Supported Capillary Channels as Liquid Acquisition Devices in Microgravity
(2016)Fluid-filled springs are capillary channels that can be used as liquid acquisition devices to passively separate two-phase systems in microgravity. However, these channels must be primed and connected to a pressure reservoir ... -
Investigations of ternary alloys using perturbed angular correlations
(2015-06)The intended goal of this research was to investigate interactions between solute atoms in intermetallics using a nuclear probe method, Perturbed Angular Correlation (PAC) of gamma rays. The PAC probe, radioactive 111In, ... -
INVESTIGATING [X/FE], IMF AND COMPOSITENESS IN INTEGRATED MODELS
(2015)This dissertation explores several existing challenges of evolutionarystellar population synthesis models in integrated light:age-metallicity degeneracy, initial mass function (IMF), elementalabundances, and compositeness. ... -
Understanding Molecular Machines: Theoretical and Experimental Approaches
(2015)This dissertation concerns the study of two classes of molecular machines from a physical perspective: enzymes and membrane proteins. Though the functions of these classes of proteins are different, they each represent ... -
ULTRAFAST CARRIER DYNAMICS IN THIN FILM HYDROGENATED AMORPHOUS SILICON AND SILICON-GERMANIUM ALLOYS
(2015)This dissertation presents an investigation of the ultrafast carrier dynamics in thin film hydrogenated amorphous silicon (a-Si:H) and silicon germanium alloys (a-Si_(1-x) Ge_x:H). These materials have attracted considerable ... -
Physics Matters, 2013-2014
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Good News, Spring 2014
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Good News, Fall 2013
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Physics Matters, 2012-2013
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Explicitly Correlated Gaussian Approach: Method Development and Application to Ultracold Few-Fermion Systems
(2013)Few-body physics plays an important role in quantum gases. For example, the lifetime of ultracold atomic gases is limited by atom losses. While atom losses are, in general, undesirable, they can be measured experimentally ... -
ULTRAFAST SPECTROSCOPY OF SELF TRAPPED EXCITONS IN QUASI-ONE-DIMENSIONAL MATERIALS
(2013)This dissertation studies the transition of electronic excitations from a delocalized state to a localized state. Such processes have a dramatic impact on optical and electronic properties and reflect fundamental interactions ... -
Atomic jump frequencies in intermetallic compounds studied using perturbing angular correlation of gamma rays
(2012-08)Atomic jump frequencies were determined in a variety of intermetallic compounds through analysis of nuclear relaxation of spectra measured using the nuclear hyperfine technique, perturbed angular correlation (PAC) of gamma ... -
Site preferences and jump frequencies of In/Cd solutes in rare earth palladium phases having the L1 sub 2 structure
(2012-07)The method of Perturbed Angular Correlation of gamma rays (PAC) was used to study site preferences of indium solutes and jump frequencies of cadmium impurities in rare-earth palladium phases RPd sub 3 which has the L1 sub ...