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Articles 1 - 10 of 10
Full-Text Articles in Physical Sciences and Mathematics
Rotational And Hyperfine Analysis Of Aus, Ian A. Wyse
Rotational And Hyperfine Analysis Of Aus, Ian A. Wyse
Macalester Journal of Physics and Astronomy
Gas phase diatomic gold sulfide, AuS, was analyzed using optical spectroscopy. High-resolution spectra were collected and characterized and a global fit of the A2∑+-X2∏3/2 (0,0), B2∑–-X2∏3/2 (0,0), and C2Δ3/2-X2∏1/2 (0,0) transitions at 15570 cm-1, 16290 cm-1, and 17670 cm-1 was compiled and resulted in rotational constant determinations for the A2∑+((2σ)1(4π)4), B2∑–((2σ)2(4π)2(2σ*)1), and C2Δ3/2 …
Power And Langmuir Probe Measurements Of H2 Rf Plasma, Alexander A. Stowell
Power And Langmuir Probe Measurements Of H2 Rf Plasma, Alexander A. Stowell
Macalester Journal of Physics and Astronomy
Methane based gases are often used to produce thin films of biomaterials, such as diamond-like carbon, through Plasma Enhanced Chemical Vapor Deposition. The characterization of the H2 plasma will give a deeper understanding of the physical processes occurring. Understanding these processes could lead to the optimization of the production of these thin films in the future. In this paper, we examine the H2 plasma using a Langmuir probe to gain information on the electron temperature and density of the plasma discharge. We measured electron temperatures of 6eV. Our Langmuir probe data indicates the electron temperature remains constant as …
The Effects Of Hydrazine Monohydrate Surface Doping On Graphene, Christian M. Stewart
The Effects Of Hydrazine Monohydrate Surface Doping On Graphene, Christian M. Stewart
Macalester Journal of Physics and Astronomy
In this project we investigate how the carrier concentration and scattering time of chemical vapor deposition (CVD) graphene samples are affected by the exposure of these samples to hydrazine monohydrate. We used both immersion techniques and vapor deposition techniques to surface dope our graphene samples. We use both Fourier transform infrared spectroscopy and Hall effect measurements to investigate these effects.We find that after surface doping CVD graphene samples, the electron concentration greatly increases while the scattering time is nearly unaffected. We also find that this doping process with hydrazine monohydrate is reversible.
Increasing The Acceptance Rate Of H-> 4e- Run 1 Events By Relaxing The Applied Cuts, Beni J. Pazar
Increasing The Acceptance Rate Of H-> 4e- Run 1 Events By Relaxing The Applied Cuts, Beni J. Pazar
Macalester Journal of Physics and Astronomy
The Decay mode of Higgs into four leptons allows for accurate parameter reconstruction and is thus a useful channel to research. The study attempted to increase the number of four electron events that pass selection cuts, without greatly increasing the amount of background noise, by varying the transverse momentum, invariant mass of the subleading electrons, and electron identification. With the application of a boosted decision tree targeting the ZZ* noise, the study found that the optimal configuration was a loose electron identification with the invariant mass greater than 10 GeV and the transverse momentum greater than 7 GeV.
Contributing To Astropy: A Community Python Library For Astronomers, Asra Nizami
Contributing To Astropy: A Community Python Library For Astronomers, Asra Nizami
Macalester Journal of Physics and Astronomy
This paper discusses the author’s contributions to two packages affiliated with Astropy, a community Python library for astronomers. The packages the author contributed to were modeling, a sub-package within the core Astropy package, and WCSAxes, an Astropy affiliated package, outside the core package.
Elastic Block Modeling Of Fault Slip Rates Across Southern California, Liam P. Dizio
Elastic Block Modeling Of Fault Slip Rates Across Southern California, Liam P. Dizio
Macalester Journal of Physics and Astronomy
We present fault slip rate estimates for Southern California based on Global Positioning System (GPS) velocity data from the University NAVSTAR Consortium (UNAVCO), the Southern California Earthquake Center (SCEC), and new campaign GPS velocity data from the San Bernardino Mountains and vicinity. Fault slip-rates were calculated using Tdefnode, a program used to model elastic deformation within lithospheric blocks and slip on block bounding faults [2]. Our block model comprised most major faults within Southern California. Tdefnode produced similar slip rate values as other geodetic modeling techniques. The fastest slipping faults are the Imperial fault (37.4±0.1 mm/yr) and the Brawley seismic …
Dissociative Excitation Of H2 In An Rf Plasma, John Carlson
Dissociative Excitation Of H2 In An Rf Plasma, John Carlson
Macalester Journal of Physics and Astronomy
Plasma-enhanced chemical vapor deposition is a widely used method for depositing thin films. In order to optimize the properties of the films, it is important to understand the plasma processes that occur during film growth. In this research we use optical emission spectroscopy in order to measure the spectral emission lines of a plasma produced with hydrogen gas. In conjunction with other measurements and modeling, these measurements can provide insight to the electron energy distribution of the plasma.
Energetic Behavior Of Resistive Random-Access Memory Cells, Christopher M. Bisbee
Energetic Behavior Of Resistive Random-Access Memory Cells, Christopher M. Bisbee
Macalester Journal of Physics and Astronomy
In order to investigate the switching characteristics of Resistive Random Access Memory cells (ReRAM) in terms of their thermodynamic free energy properties, we need to build a number of models that replicate the system. This report contains the models used to investigate filament growth patterns based on different boundary conditions applied to the electrode-filament system. Using Comsol Multiphysics software, we determined that when a fixed voltage is applied to each electrode in the electrode-filament system, we should expect filament dissolution that resets our cells into the High Resistance State (HRS). If we instead fix a set amount of charge on …
Zno Thin Films Generated By Ex-Situ Thermal Oxidation Of Metallic Zn For Photovoltaic Applications, Kovas Zygas
Zno Thin Films Generated By Ex-Situ Thermal Oxidation Of Metallic Zn For Photovoltaic Applications, Kovas Zygas
Macalester Journal of Physics and Astronomy
ZnO thin films that function as either transparent conducting oxides in solid-state photovoltaic cells or as nanocrystalline dye-absorbers in dye-sensitized solar cells have the potential to reduce the cost of producing electricity from solar energy. Although there exist many methods to produce ZnO thin films, the most economical and practical method may be oxidation of metallic Zn thin films. This research examined the utility of ex-situ thermal oxidation of DC magnetron sputtered Zn thin films in generating useful ZnO thin films for these photovoltaic applications. We annealed Zn thin films in air at 570° C in order to produce ZnO …
Protein Adsorption Using A Lattice Toy Model, Ari J. Weiland
Protein Adsorption Using A Lattice Toy Model, Ari J. Weiland
Macalester Journal of Physics and Astronomy
Protein adsorption is an important subfield of Biophysics particularly relevant in medical science. Using a computational simulation with a basic but configurable two-dimensional square lattice model of approximate amino acid interactions, I investigated the entropic effects of protein adsorption on a weakly attractive surface. These simulations allow for a precise calculation of the partition functions of these complex systems, from which I can then analyze other thermodynamic properties.