Physics Commons^™

Evaluation Of Ellipsometric Monitors For Process Control Of High Temperature Superconductors, Kyle John Peterson

Masters Theses

Current methods of manufacturing high temperature thin lm superconductors require increasingly more precise and accurate thin lm diagnostics to ensure high quality superconductors. There are several diagnostic tools for monitoring thin lms. However, due to the complex nature of superconducting thin lm stacks, ellipsometric methods are well suited for this application. This study investigates various ellipsometric methods in simulated process control environments.

A computer program was developed to generate ellipsometric data for given film stack characteristics and experimental geometry, and to analyze simulated ellipsometric data to recover optical parameters of the given film stack. The program was used to investigate …

Nuclear Structure Studies In 90Y, Ronald E. Goans

Masters Theses

Differential cross sections (12.5° to 47.5°) were measured for the ⁸⁹Y (d,p) reaction with 33.3 Mev deuterons from the Oak Ridge Isochronous Cyclotron. Proton spectra up to 5 Mev excitation in the ⁹⁰Y were observed in nuclear emulsions exposed in the focal plane of the broad range spectrograph. The resolution was approximately 25 Kev. The excitation energies agreed within experimental error with (d,p) experiments at 12 Mev and 15 Mev. Comparisons were made with DWBA calculations and ℓ-transfers were assigned to 25 levels. The ℓ-transfers and spectroscopic factors are in satisfactory agreement with previous papers for most strong …

Conductive Sphere On A Charged Conductive Plane, Birney Robert Fish

Masters Theses

Statement of the Problem: If a conductive sphere is placed in contact with a semi-infinite, conductive plane, the configuration constitutes a three-dimensional equipotential surface. Assuming an isolated plane to be electrically charged to a known surface charge density (σ_°) originally, it is desired to determine the effect produced by placing a sphere on the plane. Specifically, the purpose of this investigation is to determine the force exerted on the sphere normal to the plane, the total charge acquired by the sphere and the perturbation in the electrical field due to its presence on the plane.

Quantum Kinetic Equations For Plasmas And Radiation; Part Ii. Cyclotron Instabilities In A Bounded Plasma, Philip B. Burt

Masters Theses

The procedure for obtaining "kinetic" equations for internal distribution functions of a system was first developed by Bogoliubov* (1) in his study of.the properties of un-ionized gases. Bogoliubov also indicated some of the problems which would be encountered in a similar development for systems interacting through long-range Coulomb forces . Born and Green (3) , Kirkwood and collaborators (13, 25) and Yvon (37 ) also studied classical and quantum systems, using techniques similar to those developed by Bogolilibov. However, they too were primarily interested in un-ionized gases and liquids. Recently, Rosenbluth and Rostoker (26) derived kinetic equations for a classical …

Pseudoscalar Interaction In Nuclear Beta Decay, Chander Perkash Bhalla

Masters Theses

In Chapter I, the statement of the problem considered in this dissertation is given: the investigation of the existence of the pseudo­ scalar interaction by the formulation of the theoretical expressions for the beta longitudinal polarization and the beta spectrum in 0 --> 0 (yes) beta transitions and by a comparison of the existing experimental data with the developed theory.

In Chapter II, we explain the reasons for the incorrectness of the conventional treatment of the pseudoscalar interaction, and then give the correct form of the operator for this interaction.

In Chapter III, using the correct form of the pseudoscalar …

An Investigation Of The Effect Of High Temperature On The Schumann-Runge Ultraviolet Absorption Continuum Of Oxygen, John Stanton Evans

Masters Theses

A theoretical and experimental investigation of the absorption coefficient of molecular oxygen at high temperature is reported here. The wavelength range covered is in the vacuum ultraviolet region from 1300 A to 1740 A. The theoretical treatment covers all temperatures from 300° to 10,000° K. The experimental investigation was carried out in the temperature range of 4,000° to 10,000° K. All values of the absorption coefficient found apply only to oxygen for which the vibrational degree of freedom is fully excited.

The final results for the high temperature absorption coefficient as a function of temperature and wavelength are listed in …

Hydrodynamical Theory Of Spontaneous Fission With Applications To Mendelevium, William Douglas Foland

Masters Theses

This thesis will consider in some detail the calculation of some of the quantities considered by the papers reviewed in Chapter I. The objective of the thesis is the prediction of spontaneous-fission half-lives for nuclei with high atomic numbers.