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Articles 61 - 87 of 87
Full-Text Articles in Physics
…Y La Junta De Energía Nuclear, Habló, Aldemaro Romero Jr.
…Y La Junta De Energía Nuclear, Habló, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Nmr Detection Of Ionized Arsenic Vacancy Production In Gallium Arsenide, Richard K. Hester
Nmr Detection Of Ionized Arsenic Vacancy Production In Gallium Arsenide, Richard K. Hester
Dissertations, Theses, and Masters Projects
No abstract provided.
Cross Sections For Photoionization Of The 6²P-Fine Structure Levels Of Cesium, John Daniel Jones
Cross Sections For Photoionization Of The 6²P-Fine Structure Levels Of Cesium, John Daniel Jones
Doctoral Dissertations
"The cross sections for photoionization of excited cesium from the 62P3/2- and 6²P1/2-fine structure levels have been measured using a triple crossed-beam apparatus. Two photon beams, one for excitation and one for ionization, impinge upon an atomic beam and produce ions at the point of intersection. The relative cross section is determined from a knowledge of the ion count rate and the relative photon flux of the ionization light. The results are normalized to available theoretical calculations and compared with recombination measurements in cesium plasmas. The present cross sections are found to decrease with …
Experimental Studies Of Muonium Production And The Muonium-Antimuonium Transition In Free Space, Cheng-Shong Hsieh
Experimental Studies Of Muonium Production And The Muonium-Antimuonium Transition In Free Space, Cheng-Shong Hsieh
Dissertations, Theses, and Masters Projects
No abstract provided.
Negative Muon Depolarization In Liquid Helium And Several Hydrocarbons, David C. Buckle
Negative Muon Depolarization In Liquid Helium And Several Hydrocarbons, David C. Buckle
Dissertations, Theses, and Masters Projects
No abstract provided.
Surface Electromagnetic Waves With Damping I. Isotropic Media Ii. Anisotropic Media, Gary Shannon Kovener
Surface Electromagnetic Waves With Damping I. Isotropic Media Ii. Anisotropic Media, Gary Shannon Kovener
Doctoral Dissertations
Paper 1: “Surface electromagnetic wave (SEW) dispersion curves are usually calculated using a simple equation derived from Maxwell’s equations and boundary conditions. When complex dielectric functions are used for the two media, the component of the propagation vector along the surface kx becomes infinite as the frequency ω approaches the surface polariton frequency ωs if ω is considered complex and kx real. On the other hand, if kx is considered complex and ω real, the dispersion curves bend back toward smaller kx as ω approaches ωs. We have previously demonstrated that both types …
Measurement Of Positive And Negative Pion Total Cross-Sections On Helium-3, Beryllium-9, And Carbon-12 Over The 3/2, 3/2 Resonance Region, Charles Bailey Spence Jr.
Measurement Of Positive And Negative Pion Total Cross-Sections On Helium-3, Beryllium-9, And Carbon-12 Over The 3/2, 3/2 Resonance Region, Charles Bailey Spence Jr.
Dissertations, Theses, and Masters Projects
No abstract provided.
Physical Meaning Of The Field H, H. E. Mccloud
Physical Meaning Of The Field H, H. E. Mccloud
Journal of the Arkansas Academy of Science
Through the introduction of the concept of magnetic charge the physical meaning of the magnetic field H is established within the rationalized MKS system of units
Measurements Of The Magnetic Dipole Moments Of The Antiproton And The Sigma- Hyperon, B. Lee Roberts
Measurements Of The Magnetic Dipole Moments Of The Antiproton And The Sigma- Hyperon, B. Lee Roberts
Dissertations, Theses, and Masters Projects
No abstract provided.
Improved Calculations Of The Complex Dielectric Constant Of Semiconductors, Roger Allen Breckenridge
Improved Calculations Of The Complex Dielectric Constant Of Semiconductors, Roger Allen Breckenridge
Dissertations, Theses, and Masters Projects
No abstract provided.
Unity In The Theory Of Elementary Particles Through Group Theory, Douglas Karl Lemon
Unity In The Theory Of Elementary Particles Through Group Theory, Douglas Karl Lemon
Undergraduate Honors Capstone Projects
Science is the process of seeking unity in the diversity of natural phenomenon. The purpose of this paper is to demonstrate that group theory brings unity to the theory of elementary particles. The prime motivations are first, to find a quantitative representation of the Lorentz transformation, and second, to find a quantitative representation of angular momentum. Since both of these have continuous parameters, groups with continuous parameters, particularly Lie groups, are of interest.
The first portion of the paper develops the definition of Lie groups and their associated Lie algebras. The prerequisite definitions of transformations, groups, group representations, and continuous …
The Thermolysis Of Bornyl And Iso-Bornyl Acetates, Allen Reed Jensen
The Thermolysis Of Bornyl And Iso-Bornyl Acetates, Allen Reed Jensen
Undergraduate Honors Capstone Projects
Recent investigations in the area of acetate gas phase thermolysis indicate a mechanism which involves a similar transition state despite the acetate used. The reaction preferentially goes through a cis-elimination with the β-hydrogen atoms, proceeding through a six-membered ring transition state.
The purpose of this study is to examine the effect of a strained bicyclic ring system upon the mechanism of acetate thermolysis. Throuqh kinetic studies and product identification of the pyrolyzed products of bornyl and iso-bornyl acetate, an insight into the preferred mechanism can be obtained. A previous study (cited later) indicated that the accepted six-membered cis …
On The Lambda Transition In Solid Orthohydrogen, Harry A. Brown
On The Lambda Transition In Solid Orthohydrogen, Harry A. Brown
Physics Faculty Research & Creative Works
No abstract provided.
Optical Pumping In A Flowing Helium Afterglow With Additive Metal Impurity Atoms, Laird D. Schearer
Optical Pumping In A Flowing Helium Afterglow With Additive Metal Impurity Atoms, Laird D. Schearer
Physics Faculty Research & Creative Works
It is demonstrated that in a Penning collision of optically oriented metastable helium atoms with an impurity metal atom such as barium, both the longitudinal and transverse components of spin angular momentum are conserved. This results in a polarization of the ion which may be detected by optical emission in the case of excited ion levels or absorption for the ground states. A series of experiments is described which demonstrates the spin dependence of the Penning-collision process. The magnetic resonance of excited-state ions may be observed directly; from the resonance-linewidth radiative lifetimes may be measured. © 1974 The American Physical …
Fresnel Drag In Uniformly Moving Media, William F. Parks, J. T. Dowell
Fresnel Drag In Uniformly Moving Media, William F. Parks, J. T. Dowell
Physics Faculty Research & Creative Works
A general first-order formula is derived for the Fresnel-drag effect in a uniformly moving medium with a plane surface. The two classical equations due to Lorentz and Laub are shown to be special cases corresponding to different experimental arrangements. The recent experiment of Bilger and Zavodny on Fresnel drag in a ring laser is discussed. © 1974 The American Physical Society.
Measurements Of The Average Electric Dipole Polarizabilities Of The Alkali Dimers, Robert W. Molof, Thomas M. Miller, Henry L. Schwartz, Benjamin Bederson, John T. Park
Measurements Of The Average Electric Dipole Polarizabilities Of The Alkali Dimers, Robert W. Molof, Thomas M. Miller, Henry L. Schwartz, Benjamin Bederson, John T. Park
Physics Faculty Research & Creative Works
The average electric dipole polarizabilities of the homonuclear alkali dimers have been measured in an electric deflection experiment. The molecular results are normalized to the corresponding atomic polarizabilities by comparing deflections of atomic and molecular alkali beams passing through an inhomogenous electrostatic field. The average polarizabilities in units of 10-24 cm3 are: Li2(990°K), 34±3; Na2(736°K), 30±3; K2(569°K), 61±5; Rb2(534°K), 68±7; Cs2(515°K), 91±7. Copyright © 1974 American Institute of Physics.
Charge Transfer Between O Ions And O2 Molecules In The Ground State And Singlet Delta Excited State, R. F. Mathis, William R. Snow
Charge Transfer Between O Ions And O2 Molecules In The Ground State And Singlet Delta Excited State, R. F. Mathis, William R. Snow
Physics Faculty Research & Creative Works
A crossed-beam apparatus has been used to study charge transfer between O- ions and O2 molecules in the ground state and in the metastable, singlet delta, excited state. The energy of the incident ions ranged from 10 to 10000 eV. The cross section for charge transfer between O - and ground state O2 was found to have a maximum of 7.8X10-16 cm2 at about 5 keV. At the lower energies there is good agreement with the previous measurements of Snow et al. and Rutherford and Turner who also used crossed beam techniques. The cross section for charge transfer between O- …
Evaluation Of Model For The Contributin Of Phonon-Induced Tunneling To Donor Esr Spectral Narrowing In Germanium, David L. Meier, William F. Parks, Edward Boyd Hale
Evaluation Of Model For The Contributin Of Phonon-Induced Tunneling To Donor Esr Spectral Narrowing In Germanium, David L. Meier, William F. Parks, Edward Boyd Hale
Physics Faculty Research & Creative Works
The model commonly assumed to explain the narrowing of the ESR spectra of donor impurities in germanium is examined in detail. This model combines the Anderson line-narrowing theory with the Miller and Abrahams theory for the phonon-induced tunneling (hopping) of an electron between impurities. The predictions of this model are found to be in drastic disagreement with experimental results now available. It is shown that the narrowed linewidth should depend strongly on donor concentration, acceptor concentration, and temperature. Future spin-resonance experiments in highly compensated samples may show the effects of hopping, but no evidence now exists which indicates that hopping …
Double Reflection Dips - From Grating Ruled Semiconductors, Le-Fu Teng
Double Reflection Dips - From Grating Ruled Semiconductors, Le-Fu Teng
Doctoral Dissertations
"The double dips, previously observed by Fischer, Anderson, et al., which appeared in the reflection spectra of grating surfaces on the Te-doped semiconductors GaAs and InSb around the plasmon and phonon frequencies have been measured in more detail. In the plasmon region, several possible explanations of the phenomenon are discussed. A simple equation checked with the rigorous theory is proposed and is shown to fit the data well. In the phonon region, the extra dip is calculated and identified as being caused by surface phonons"--Abstract, page ii.
Comments On 'Fluctuations In Guiding Center Plasma In Two Dimensions', George Vahala, Linda L. Vahala, David Montgomery, Glenn Joyce
Comments On 'Fluctuations In Guiding Center Plasma In Two Dimensions', George Vahala, Linda L. Vahala, David Montgomery, Glenn Joyce
Electrical & Computer Engineering Faculty Publications
It is stated that the principal result of the paper by Taylor and Thompson (see abstr. A14511 of 1973) on autocorrelations in density for the electrostatic guiding center plasma in two dimensions is wrong owing to an incorrect integration. It is further stated that there is no meaningful distinction between an `interaction cutoff' and a `fluctuation cutoff'.
Intuitive Concepts In Elementary Topology, Gary Rothwell
Intuitive Concepts In Elementary Topology, Gary Rothwell
Honors Theses
My hour special study in intuitive topology originated in a curiosity of what exactly topology was and how it might be related to physics, my field of interest. The book I used was, Intuitive Concepts in Elementary Topology, by B.H. Arnold. This book is designed as a sophomore-junior level three hour course. Needless to say, I didn't quite cover the whole book in an hour a week. I mainly stuck to the intuitive concepts. Intuitive topology is dealing with more physical objects where the point set topology involves set theory; their unions, intersections and subsets.
Combined Airglow And Incoherent Scatter Observations As A Technique For Studying Neutral Atmospheric Variations, L L. Cogger, Vincent B. Wickwar, Herbert C. Carlson
Combined Airglow And Incoherent Scatter Observations As A Technique For Studying Neutral Atmospheric Variations, L L. Cogger, Vincent B. Wickwar, Herbert C. Carlson
All Physics Faculty Publications
Night airglow 6300 Å intensities and electron density altitude profiles observed at Arecibo have been combined with dissociative recombination theory to obtain information about the nighttime variation of F-region N2 and O2 densities. The application of this technique is illustrated using data from two nights in March 1971. The gross nighttime variation shows reasonable similarity to the Jacchia [1970] model, and also follows the time variation of the measured exospheric temperature. However, on both nights there is evidence of a postmidnight enhancement of the O2/N2 density ratio associated with a rapid decrease in the …
Cryogenic Thin-Film Electron Emitters, Pavel Smejtek, David G. Onn, M. Silver
Cryogenic Thin-Film Electron Emitters, Pavel Smejtek, David G. Onn, M. Silver
Physics Faculty Publications and Presentations
Thin‐film electron emitters are described, which operate below 200°K and below a limiting critical applied voltage (νc) in a stable temperature‐independent regime. Current‐voltage characteristics and normal electron energy distributions are presented. Fabrication and operation criteria are outlined. Comparison with temperature‐dependent emitters is made, and possible conduction mechanisms discussed briefly.
Statistical Time-Dependent Model For The Interstellar Gas, H. Gerola, Menas Kafatos, R. Mccray
Statistical Time-Dependent Model For The Interstellar Gas, H. Gerola, Menas Kafatos, R. Mccray
Mathematics, Physics, and Computer Science Faculty Articles and Research
We present models for temperature and ionization structure of low, uniform-density (n ~ 0.3 cm^-3) interstellar gas in a galactic disk which is exposed to soft X-rays from supernova outbursts occurring randomly in space and time. The structure was calculated by computing the time record of temperature and ionization at a given point by Monte Carlo simulation. The calculation yields probability distribution functions for ionized fraction x, temperature T, and their various observable moments. These time-dependent models predict a bimodal temperature distribution of the gas with structure in x, T that agrees with various observations. Cold regions in the low-density …
Incoherent Scatter Radar Observations Of Westward Electric Fields And Plasma Densities In The Auroral Ionosphere, 1, M P. Banks, C L. Rino, Vincent B. Wickwar
Incoherent Scatter Radar Observations Of Westward Electric Fields And Plasma Densities In The Auroral Ionosphere, 1, M P. Banks, C L. Rino, Vincent B. Wickwar
All Physics Faculty Publications
This paper reports the results of incoherent scatter radar observations of high-altitude ion drifts and other plasma parameters made February 24, 1972, at Chatanika, Alaska (L = 5.7), during a period of magnetic disturbance. For this experiment, conducted between 0909 to 1303 UT (2309 to 0303 AST), the radar line of sight was held fixed in the magnetic meridian plane so that the observed north-south ion drifts could be interpreted in terms of a westward electric field that ranged in magnitude from −10 to +35 mV m−1. The results confirm many effects found previously through other experimental …
Heat Transfer Across Carbon-Liquid Helium I Interface, Constantine Antonopoulos
Heat Transfer Across Carbon-Liquid Helium I Interface, Constantine Antonopoulos
Dissertations and Theses
The subject to be discussed in this thesis is an experimental problem in heat transfer across a carbon-liquid helium I interface. The interest in this particular problem arose from experimental work first presented by Luce (1) concerning a similar heat transfer problem from a heated bismuth surface immersed in liquid helium. This study produced some interesting results which it was hoped could be duplicated with carbon. The choice of carbon as an alternative material was based on reasons which will be discussed later. Before beginning a detailed discussion of the problem a history of its development and the results which …
Incoherent-Scatter Radar Observations Of Westward Electric Fields, 2, C L. Rino, Vincent B. Wickwar, P M. Banks, E Rieger, S Akasofu
Incoherent-Scatter Radar Observations Of Westward Electric Fields, 2, C L. Rino, Vincent B. Wickwar, P M. Banks, E Rieger, S Akasofu
All Physics Faculty Publications
In this paper we describe the results of a series of geomagnetic meridian plane radar incoherent scatter plasma transport measurements. From such data the eastward (zonal) component of the electric field can be deduced. The results show that the electric field has an eastward component whenever the discrete auroras are northward of the region of the measurement. The zonal field component turns westward as the discrete auroras move equatorward of the region of the measurement. Thus there is an eastward electric field boundary near the equatorward limit of the discrete aurora, which is the poleward boundary of the diffuse aurora …