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F Band In X- And Electron-Irradiated Caf2, David A. Patterson, Robert Fuller

Robert G. Fuller Publications

This Letter reports an investigation using pulsed electron irradiation to determine if the low efficiency of F-band coloration in calcium fluoride is caused by the instability of the F center. No transient F centers were seen in times as short as 2 x 10^-7 sec. It is concluded that the inherent efficiency of F-band coloration in CaF₂ is small compared with similar processes in alkali halides and a possible reason for this is discussed.

Calcium fluoride has been extensively studied and is found to be more difficult to color than alkali halides and to have absorption …

Integral Series Solution Of The Schrödinger Equation For The Helium Atom, W. Byers Brown, Ronald White

Center for Advanced Mineral and Metallurgical Processing (CAMP)

No abstract provided.

Analytic Power-Series Solution Of The Schrödinger Equation For The Helium Atom, W. Byers Brown, Ronald White

Center for Advanced Mineral and Metallurgical Processing (CAMP)

No abstract provided.

Mössbauer Evidence For A Spin-Compensated State In Dilute Fe-Cu Alloys, Richard B. Frankel, N. A. Blum, Brian B. Schwartz, Duk Joo Kim

Physics

No abstract provided.

Rocket Probe Measurement Of Electron Energy Spectra In The Earth's Radiation Belts, Donald Stuart Robb

Physics & Astronomy ETDs

No abstract provided.

Inelastic Collisions Of The Second Kind Between Electrons And Excited Mercury Atoms, Paul Burrow

Paul Burrow Publications

The relative cross section for inelastic collisions of the second kind between electrons and mercury atoms in the excited ³P₁ state was measured as a function of electron energy. Excited atoms were produced by absorption of the 2537 Å resonance line from a mercury arc. A low-energy beam of electrons was produced using the retarding potential difference method. Scattered electrons which gained kinetic energy were detected by passing them through a potential barrier which reflected unscattered electrons. The data are in good agreement with the cross section computed by applying detailed balancing to the known cross section for …

Nuclear Quadrupole Relaxation., Derwin F. Brown

Physics & Astronomy ETDs

A nucleus with an asymmetric charge distribution (an asymmetric arrangement of protons) exhibits a quadrupole moment which interacts with the gradient of the electric field of the surrounding electrons. The interaction energy is a function of the angle between the nuclear spin axis and the axis of the surrounding electric field. The nucleus processes about the electric field axis in quantized energy states. These quantized energy states correspond to a hyperfine splitting simi­lar to the hyperfine structure of the magnetic dipole-dipole interaction between the nucleus and the electrons. The application of an external electric field, oscillating at the processional frequency …

An Introduction To The Fundamentals Of Radiation Transport Theory., William A. Proctor

Physics & Astronomy ETDs

I first became interested in radiation transport theory when, in August 1966, I was given primary responsibility for a large computer program which serves as a tool for solving high temperature, time dependent, radiation-hydrodynamics problems. Inquiries as to where to start learning about this subject invariably resulted in my being directed to the two books by Chandrasekhar (1957 and 1960) and the book by Kourganoff (1963). From the beginning of my study of these expositions, I found it rather curious that a theory which treated the radiation field as continuously distributed in space was formulated in a manner which appeared …

Environmental Effects On The Resistivity Of Palladium-Silver Alloy Films In High Vacuum, Frank Snyder

Masters Theses & Specialist Projects

The reported usage of the palladium-silver alloy films as resistors in the electronics industry has been in encapsulated form. By mounting the resistor inside vacuum electron devices, there is the possibility of eliminating the encapsulation. A literature search has revealed no reported efforts of experiments with unencapsulated resistors and certainly no reports of the palladium-silver alloy resistor in vacuum tubes or other high vacuum environments. Therefore, the research reported in this thesis will concentrate on the environmental effects on resistivity of palladium-silver alloy films in high vacuum.

Measurements Of Solar X-Ray Emission From The Ions Carbon Vi And Nitrogen Vii, Winifred Doyle Evans

Physics & Astronomy ETDs

Studies of the solar spectrum in the extreme ultraviolet and x-ray region have been possible since sounding rockets and satellites have been available to carry instruments above the earth's atmosphere. Progress was slow at first, but techniques have improved rapidly in recent years and a considerable body of experimental data has been accumulated since the first rocket flights in the late 1940’s.

A Study Of Chromium-Doped High Lead Containing Silicate Glasses For Possible Laser Action, Mervet Maurice Saleh

Archived Theses and Dissertations

No abstract provided.

Rapid Calculation Of Electron Scattering Factors, Jerry Peacher, John G. Wills

Physics Faculty Research & Creative Works

The phase amplitude method is used to reduce the radial Schrödinger equation to two separate differential equations, one for the phase and one for the amplitude. These functions are both smooth as opposed to the rapidly oscillating solution of the radial Schrödinger equation for electron energies in the kilovolt range. The partial-wave phase shifts were obtained rapidly by integrating the differential equations for the phase and amplitude numerically. Hartree-Fock and Thomas-Fermi-Dirac fields were used in the calculation. Results for argon and uranium are given in order to compare with previous results. It was found that the WKBJ approximation to the …

Step-Wise Variation Of Spectrometer Quench Rates For Nuclear Quadrupole Resonance Measurements, Curtis M. Wise

Physics & Astronomy ETDs

In nuclear quadrupole resonance (NQR) it is desirable to better examine the magnitude of the resonance signals. This thesis describes the construction and testing of spectrometer control circuits which enable one to better examine a single resonance signal to the near exclusion of extraneous resonance side band responses and circuit noise in the NQR detection apparatus. Added to the basic spectrometer circuit is a step-wise varying quench rate control. For each adjustment of this control other control units are activated to keep the chosen NQR signal fixed in position and in magnitude within the spectrometer's span of detected radio frequencies. …

Analysis Of Particle Counting Rate Variations Observed On Satellite Oso-B2, Esther Y. Ma

Physics & Astronomy ETDs

The ommidirectional cosmic ray fluxes at an altitude of 300 miles and within ± 34 degrees latitude were studied using two Cerenkov counters and a scintillation counter aboard the 0S0-82 Satellite. The fluxes were found to depend strongly on the geomagnetic field with the trapped particles in the South Atlantic Radiation Anomaly being directional in some locations.

²⁰⁷Pb (N, N') ²⁰⁷Pbm And ²⁰⁸Pb (N, 2n) ²⁰⁷Pbm Cross Sections, Edward Raymond Shunk

Physics & Astronomy ETDs

The cross sections for the production of the ²⁰⁷Pb^m state from ²⁰⁷Pb(n, n') and ²⁰⁸Pb(n, 2n) have been measured from the threshold through 14 MeV by observing the 1 .064 MeV gamma ray in the decay of ²⁰⁷Pb^m (T _½ = 0.818 ± 0.004 sec) with a 3 in. x 3 in. NaI (T1) detector. Separated lead isotopes were irradiated for 4 sec and pneumatically transported to the detector. A 400-channel analyzer a used a time analyzer to record counts from neutron monitor during the irradiation and from the detector after the irradiation. These …

Single And Multiple Pion Production In Π⁺N And Π‾P Interactions At 1.7 Gev/C, William J. Fickinger, D. K. Robinson

Faculty Scholarship

Meson production in π-p and π+n interactions at 1.7 GeV/c has been studied in two bubble-chamber exposures. Combined results are presented with emphasis on single-pion production (4300 events) which is dominated by the formation of the ρ0 meson in peripheral interactions, and on double-pion production (1100 events) which shows strong formation of the ω meson. These data are compared with the predictions of particle-exchange models, including absorption, and the effects of competing channels are discussed. Evidence for a two-pion decay mode of the ω is examined quantitatively. Processes with higher meson multiplicities are described.

Surface-Wave Phenomena At Liquid-Air Interfaces, Robert H. Dungan

Physics & Astronomy ETDs

The purpose of this investigation was to continue the study of surface wave phenomena initiated by Woodward and Bryant. [l], [2] Woodward, using an experimental arrangement similar to that shown in Fig. 3, observed that the intensity of light measured above, but parallel to, the reflected beam was a very sharp function of the incident beam angle at the critical angle. They also observed that the light intensity above the reflected beam decreased exponentially as the detector was moved away from the reflected beam in the plane of incidence. They reported characteristic lengths for the exponential decay constant of 9.6 …

Observation Of Centrifugal Stretching In Sm152, D. Yeboah-Amankwah, L. Grodzins, Richard B. Frankel

Physics

An isomer shift has been observed in the Mössbauer study of the 121.8-keV (2⁺→0⁺) transition in Sm¹⁵². A value of (Δ〈R²〉/〈R²〉)_2-0=(10±3)×10^-4 is deduced, based on isotope shift data for Sm¹⁵² and Sm¹⁵⁴. This value disagrees with present theoretical prediction. In particular, the influence of the β band in Sm¹⁵² can only account for about 20% of the observed stretching.

Epr Spectra Of Divalent Manganese In Halide Crystals, Veron Sarkis Sarkissian

Archived Theses and Dissertations

No abstract provided.

The Alignment Procedure Of A Two Crystal Spectrometer, Jay W. Phippen

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

For the sake of completeness, it was felt that a brief resume' of x-ray scattering theory as it affects the alignment procedure of a two crystal spectrometer would be beneficial.

X-ray diffraction from a single crystal slab.

W. L. Bragg (1912) tried the experiment of reflecting a beam of x-rays from the cleavage surface of a crystal and found on the photo-graphic plate a spot at the angle of reflection. He then replaced the photo graphic plate with an ionization chamber which he mounted so that it could be rotated about the axis upon which the reflecting crystal is …

A Study Of Aluminium-Lead Borate Glass Composite Materials, Aziza Nour El-Din Ragai

Archived Theses and Dissertations

No abstract provided.

Conductivity And Photoconductivity Of As-S-I Glasses, Ahmed Abdel-Hamid El-Difrawi

Archived Theses and Dissertations

No abstract provided.

Molecular Vibrations Of Tetrahedral Systems With Application To Fused Silica, Leila Sado Balloomal

Archived Theses and Dissertations

No abstract provided.

Movement Of Atrazine In Soil Under Furrow Irrigation, Jyothi Veerabhadrappa

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Movement of atrazine in response to furrow irrigations was studied using the samples of Timpanogos silt loam soil. Distribution in soil profile of surface applied herbicide was determined by drawing samples of water extracts through porous cylinders. Atrazine quantity was determined by spectrophotometer.

It was observed that the herbicide found in the water extracts was an indication of the quantity present in the soil. The herbicide moved readily with the applied water. Irreversible thermodynamic model could not be applied because of the initial and final boundary conditions. The pattern of movement was in conformity with the chromatographic theory.

The 233u Fission And Capture Cross Sections And Their Analysis At Low Engines, Delmar W. Bergen

Physics & Astronomy ETDs

The ²³³U fission and capture cross sections were measured using a nuclear-device neutron source and time-­of-flight techniques. Cross section data are presented from 20 to 10⁶ eV for fission and from 20 to 63 eV for fission + capture. The resonance region (20 eV to 63 eV) was fitted with both a single level function consisting of a sum of Breit-Wigner levels and the Reich and Moore multilevel function based on R matrix theory. The resulting resonance parameters are listed and discussed. In order to establish the validity of the resonance parameters derived from the multilevel fit, a …

Development Of A Method For Measuring Magneto-Optical Rotatory Dispersion, Donald K. Loving

Masters Theses

No abstract provided.

Low Temperature Sample Orienting Device With Two Degrees Of Freedom, David J. Sellmyer

David Sellmyer Publications

The purpose of this note is to describe a sample orienting device which has been used successfully at liquid helium temperatures to measure the high-field magnetoresistance of several single-crystal metallic compounds in a solenoidal field.

High‐Magnetic‐Field Studies Of Orthorhombic And Rhombohedral Al2−XFeXO3 Compounds, M. Schieber, Richard B. Frankel, N. A. Blum, S. Foner

Physics

Mössbauer and magnetic susceptibility experiments at temperatures down to 4.2°K and in external fields up to 140 kOe show orthorhombic Al_2−xFe_xO₃ (0.61.6Fe_0.4O₃ is paramagnetic above 80°K, and at 4.2°K exhibits a Mössbauer spectrum characteristic of a nonunique hyperfine field; the application of an external magnetic field produces a spectrum with an enhanced Δm=0 line which suggests a canted spin structure similar to that in the high‐temperature phase (T>260°K) of αFe₂O₃.

Pumping And Horsepower, R P. Harington

Journal of the Department of Agriculture, Western Australia, Series 4

WATER is vital to the survival of plants and animals and its availability will influence the site of the homestead and the farm layout generally.

This article describes some of the factors involved in the installation of a pumping outfit for domestic and stock requirements.

Magnetic Properties Of The Bifeo₃-Pbtio₃-Pbzro₃ Ternary System, James Ivan Latham

Doctoral Dissertations

"The magnetic susceptibility and spontaneous magnetic moment of the perovskitic, polycrystalline solid solutions of BiFeO₃ with PbTiO₃, PbZrO₃, and [50PbZrO₃·50PbTiO₃] were determined using the Faraday method. Pure BiFeO₃ has a G-type antiferromagnetic structure. Although the perovskite BiFeO₃ exhibits a sharp peak in the susceptibility at the Néel temperature, it does not possess a spontaneous magnetic moment. The solid solutions investigated possessed a spontaneous magnetic moment throughout the multiple cell rhombohedral region of the BiFeO₃-PbTiO₃-PbZrO₃ ternary phase diagram, which extends from pure BiFeO₃ to …