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Calculations of the ground state energy and exchange integrals of crystalline $sup 3$He

Description: Thesis. The variational equation is derived and discussed using Jastrowtype wave functions, which are a product of pair wave functions, as the trail wave function. The various approximations used in simplifying the variational equations so as to obtain a form that is possible to solve numerically are discussed also. A Monte Carlo calculation is described using the wave function obtained. Exchange in /sup 3/He is discussed. (MHR)
Date: July 1, 1973
Creator: Lim, W L
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Capillary permeability and lymph flow in the irradiated rat

Description: Thesis. Exposure of rats to 700 rads whole-body /sup 60/Co gamma irradiation increased capillary permeabilily by 47% and increased lymph flow by 124% 48 hrs following irradiation, while exposure to 1000 rads caused an increase of capillary permeability of 98%, but did not change lymph flow from control values. The latter result may have been due to the relative dehydration and immobility of the 1000 rad group. Rats drinking large quantities of 5% dextrose + 0.7% NaCl solution did not increase l… more
Date: November 1, 1973
Creator: Graham, M. M. & Dobson, E. L.
open access

Color Center Phenomena in Sodium Chloride. Special Report No. 12

Description: Thesis. Absorption spectra of M centers in x-ray-colored Harshaw NaCl crystals were measured at several temperatures between 66 and 274 deg K using a Cary 14 PMR Spectrophotometer. Also measured in NaCl were the absorptions of M/ sup +/ and R/sup +/ centers at 80 deg K. Additively colored crystals were found to be unsuitable for studies of the absorptions of F-aggregate centers because of low concentrations of F centers and persisting colloid absorptions. In order to examine M bands free of ove… more
Date: December 1, 1973
Creator: Weinstein, Alvin E.
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COMPUTER SIMULATION OP FRANK LOOP CONTRAST IN FIELD IONIMAGES

Description: A computer model for simulation of the image contrast caused by Frank dislocation loops in field ion tips of fcc materials is presented. The model is based on the shell model for ion image simulation, whereas the displacement field of Frank loops is computed from the exact displacement equation for a closed dislocation loop in an isotropically elastic continuum. A method for taking surface effects into account by superposition of the displacement field of an image loop is introduced. The result… more
Date: September 1, 1973
Creator: Stolt, Kaj Gunnar
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Dynamics of nonreactive inelastic ion--molecule collisions

Description: Thesis. A tandem electrostatic energy analyzer molecular beam apparatus was built for studying low energy inelastic 180 deg scattering of alkali ions from molecules. A beam of essentially monoenergetic ions is produced by a first analyzer and is focused on the center of a scattering cell containing essentially stationary molecules. Ions which are not significantly deflected in their laboratory motion after collisions with the molecules are energy analyzed with a second analyzer.'Ine scattered b… more
Date: August 1, 1973
Creator: Dimpfl, W. L.
open access

Effects of electron irradiation on p-type germanium at liquid helium temperatures using ac hopping conductivity

Description: P-type germanium single crystals (8 x 10/sup 14/Ga/cm/sup 3/ and 6 x l0/ sup 1 Ga/cm/sup 3) were irradiated with 1.1-Mev electrons at pumped liquid helium temperatures and defect production and annealing studied using ac hopping conductivity. Production rates obtained from measurements at 1.5 deg K and 10/ sup 4/ Hz were 0.6 cm/sup -10/ for samples doped 6 x 10/sup 15/ Ga/cm/sup 3/ and 0.11 cm/sup -10/ for samples doped 8 x 10/ sup 14/ Ga/cm/sup 3/. Above 10/sup 14/ e,/cm/sup 2/ fluence the pro… more
Date: October 1, 1973
Creator: Roop, Raymond Marvin
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