Browsing Physics and Astronomy by Title
Now showing items 28-42 of 42
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On the Role of Projectile Electrons in an Independent Electron Model Description of Dressed-Ion Impact on Atoms
(2016-11-25)The presence of electrons on ions which collide with neutral atoms constitutes a challenge to theoretical descriptions of the collision dynamics. These collisions pose quantum-mechanical many-body problems that cannot be ... -
Photometric Calibrations of Metallicity and Temperature For M Dwarfs
(2015-08-28)Based on a carefully collected sample of dwarf stars, a new empirical photometric calibration to estimate the metallicity of late-type K and early-to-mid-type M dwarfs is presented. The calibration sample has two parts; ... -
Precision Microwave Frequency-Offset Separated-Oscillatory-Fields Measurement of the 2^3 P_1to-2^3 P_2 Fine-Structure Interval in Atomic Helium
(2019-07-02)The 2^3P_1-to-2^3P_2 fine-structure interval in atomic helium is measured using the frequency-offset separated-oscillatory-fields (FOSOF) technique. Two temporally separated microwave fields set up excitation paths that ... -
Quantum Interference Effects in Precision Spectroscopy of Helium Fine Structure
(2017-07-26)Precision spectroscopy of atomic helium fine structure provides a means of testing fundamental few-body theory as well as determining the fine-structure constant, which characterizes electromagnetic interactions in nature. ... -
Quantum-Mechanical Approach to Collision-Induced Radiative Emissions
(2018-05-28)Charge exchange is a process that occurs in an atomic collision where an electron from one of the colliding particles is transferred to the other; typically from a neutral atom or molecule to an ion. Electrons transferred ... -
Search For Magnetic Monopoles in 8 TEV Centre-of-Mass Energy Proton-Proton Collisions With the Atlas Detector at the LHC
(2016-09-20)Symmetry is fundamental to our understanding of the laws of nature. The simplicity that is found in the symmetries that explain the most fundamental interactions is remarkably beautiful. Physicists have worked hard and ... -
Semi-Empirical Modeling of Radiolytic Production in the Mars Northern Polar Region
(2016-09-20)A model to simulate the radiolytic production of various compounds in the Mars northern polar region was developed. Galactic cosmic rays are used as the source of particle radiation. Particle energy distributions are ... -
Sensitivity Studies for Argus 1000 Micro-Spectrometer: Measurements of Atmospheric Total Column Carbon Dioxide By Reflected Sunlight
(2016-09-20)A sensitivity analysis of the atmospheric boundary layer (ABL) and the atmospheric total column carbon dioxide was performed. The absorption of reflected solar radiation from the atmosphere and Earths surface near 1.58 m ... -
Stand-Off Detection of Organic Compounds on Mars Using Ultraviolet Raman Spectroscopy and Time-Resolved Laser-Induced Fluorescence
(2016-09-20)Recent discoveries of organic carbon and methane on Mars have continued to motivate the search for complex organics on the Martian surface. Instrumentation that directly identifies and characterizes organic carbon is a ... -
Synthesis, Characterization and Application of Barium Titanate Particles in Light Emitting Devices
(2016-09-20)The search for low-cost technologies that reduces our energy consumption is a priority in our struggle for the well-being of our environment. This project had two objectives : (1) Synthesizing BaTiO3 nanoparticles of a ... -
Tatooine's Future: Dynamical Evolution of Planets Orbiting Two Stars
(2018-03-01)Science fiction has long teased our imaginations with tales of planets with two suns. How these planets form and evolve, and their survival prospects, are active fields of research. Expanding on previous work, four new ... -
Testing CPT And Antigravity With Trapped Antihydrogen At ALPHA
(2016-09-20)High precision antihydrogen experiments allow tests of fundamental theoretical descriptions of nature. These experiments are performed with the ALPHA apparatus, where ultra-low energy antihydrogen is produced and confined ... -
The Impact of Atmospheric Models on the Dynamics of Space Tether Systems
(2016-09-20)Space debris has become an increasingly larger concern for aerospace travel and exploration. One idea to control the space debris population is to de-orbit defunct satellites using a space tether system. A space tether ... -
Topological Dynamical Systems Methods in Early-Universe Cosmologies
(2015-01-26)This dissertation describes some important problems that we have tried to solve with respect to the state of the early universe, that is, the universe shortly after the Big Bang. Standard early-universe cosmological ... -
Volatile Ice Deposits in Lunar Polar Regions and Their Sources
(2018-11-21)An amalgamation of code adapted from Schorghofer [2014] and Moores [2016] was used to simulate the movement of volatiles on the present-day surface of the Moon. The trapping of volatiles in permanently shadowed regions ...