Browsing by Author "Loch, Stuart"

Now showing items 1-16 of 16

Advanced Analytical Treatment of Shapes and Shifts of Hydrogenic Spectral Lines in Plasmas and its Applications

Sanders, Paul IV (2018-04-24)

This work presents a detailed analysis and improvement of various aspects of the theory of the Stark broadening of hydrogen and hydrogen-like ions for a broad range of dense plasma parameters, while looking at both the ...

Characterization of Chromium Trihalide based Magnetic Tunnel Junctions via First Principles Calculations

Heath, Jonathan (2021-04-12)

At finite temperatures, free-standing two-dimensional (2D) materials were originally theorized to be thermodynamically unstable, let alone possess magnetization. However, in 2018, the first ferromagnetic 2D semiconductor ...

Electron Correlation in the Two-Color Photoionization and Laser Dissociation of H2+

Gatton, Averell (2018-06-05)

We have constructed, to our knowledge, a first of its kind two-color pulsed synchrotron (XUV) and strong field laser (IR) COld Target Recoil Ion Momentum Spectroscopy (COLTRIMS) experiment. We describe the design, ...

Electron dynamics in inner-shell photo-ionization, dielectronic recombination and electron impact excitation

Wang, Qianxia (2016-08-05)

This dissertation includes three main topics: Dynamics of outgoing inner shell photoionized electrons and Auger decay electrons, an investigation into the recently proposed mechanism of below threshold dielectronic ...

Filamentation and Formation of Imposed Patterns in Low-Pressure Magnetized Electric Discharges: A Numerical Approach

Menati, Mohamad (2020-08-03)

Presence of strong magnetic fields (B ≥ 1.0 T) in magnetized dusty plasma experiments can result in a variety of phenomena in the background plasma and in the dust cloud. In the background plasma, the magnetic field induces ...

Investigation of the Redistribution of Kinetic Energy in a Microgravity Complex (Dusty) Plasma

McCabe, Lori (2022-07-28)

In the presence of gravity, the micron-sized charged dust particles in a complex plasma are compressed to thin layers, but under the microgravity conditions of the Plasma Kristall-4 (PK-4) experiment on the International ...

Many-Body Dipole Interactions

Hernandez, Jesus (2008-08-15)

This dissertation presents the study of controllable but strong long-range interaction between dipoles. In particular, we investigate the excitation and interaction between atoms in a cold gas where the collisional time ...

Modeling of Warm Dense Plasmas for the Determination of Transport Properties and Equation of State

Gill, Nathanael (2020-05-14)

We present the results of research studying the properties of dense plasmas using the average atom model. The average atom model is a physically reasonable statistical representation of an atom in a plasma, and various ...

Non-perturbative calculations of atomic data for applications in laboratory fusion and astrophysical plasmas

Wu, Di (2012-12-13)

Results are presented for non-perturbative quantal calculations of atomic data for application in laboratory fusion and astrophysical plasmas. One of the key issues in laboratory fusion plasmas is the accurate modeling ...

On the study of atomic and molecular processes affecting Astrophysical Plasma using high-resolution optical and UV spectroscopy

Nemer, Ahmad (2019-06-13)

Rydberg Enhanced Recombination (RER), a recombination process related to dielectronic recombination in which electrons are captured into energy states below the ionization threshold, has been theoretically predicted to ...

Particle Charge Determination in a Magnetized Dusty Plasma Flow

Funk, Dylan (2023-05-04)

Dusty plasmas consist of components typically found in a plasma (electrons, ions and neutral particles) as well as micrometer sized dust particles. The structural and dynamic properties of a dusty plasma system are ...

Photodissociation dynamics of vibrationally excited hydrogen molecules examined with reaction microscopy in kinematically complete VUV + NIR experiments

Burrows, Spenser (2023-12-04)

Using the Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) technique, we investigated the dissociation of vibrationally excited H₂ and D₂ molecules after two-color vacuum ultraviolet (VUV) + near-infrared (NIR) ...

The role of atomic excited states in laboratory plasmas and a study in fine structure diagnostics for far infra-red astrophysical observations

Pearce, A. Jonathan (2016-12-09)

This dissertation has a focus on the role of atomic excited states in laboratory and astrophysical plasmas. The emphasis is on systems for which perturbation theory is not expected to produce accurate results. The work ...

The role of excited state electron-impact ionization and configuration mixing in the population modeling of neutral Ne and W in fusion-capable plasmas using large-scale R-matrix collisional data

Favreau, Connor (2019-12-09)

This work reports on large-scale non-perturbative \textit{R}-matrix quantum mechanical calculations for neutral neon and tungsten. In addition, generalized collisional-radiative modeling of neutral neon and tungsten is ...

A spectroscopic neutral density diagnostic and exploration of the role of metastable states in fusion and astrophysical plasmas

Williamson, Eleanor (2023-12-04)

Understanding the transition region between fully ionized and neutrally dominated plasmas is important to the study of the magnetosphere of the earth, the corona/chromosphere transition regions of the sun, and detached ...

Theoretical modeling combined with experimental spectroscopic measurements for the diagnosis of high-Z erosion and transport applications in plasmas

Johnson, Curtis (2020-12-11)

Understanding plasma-material interaction (PMI) continues to be a challenge for future fusion reactors. High-Z materials (e.g. tungsten, molybdenum) have emerged as leading solutions for plasma facing materials. Erosion ...