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Lifetime of helium metastable spin-states in a helium discharge
(1965)
The lifetime of a helium 23s1 metastable atom electronic spin-state is measured in helium gas using optical pumping techniques. The metastable atoms are created by an RF electrical discharge. The spin-state lifetime is ...
Geophysical study of deep-crustal structure: Mid-Atlantic passive continental margin
(1997)
Migration results of two multi-channel vertical incidence reflection seismic dataset offshore Virginia are presented. A new velocity model derived from multi-channel and wide-angle reflection/refraction data is developed ...
A theoretical study of cyanide on alkali-halide and alkali-metal surfaces using density functional theory
(1995)
Many interesting physical phenomena have been observed in electron-stimulated desorption studies of the cyanide molecule on alkali halide and alkali metal surfaces. We have performed a theoretical investigation of the ...
A survey of stars and compact sources in the Orion Nebula
(1996)
Four monochromatic (H$\alpha$, (N II), (O III) and 5500 A continuum) mosaics of the inner region of the Orion Nebula have been made by using data obtained with the Wide Field Planetary Camera 2 of the Hubble Space Telescope. ...
Van der Waals interactions in density functional theory
(1998)
Various density functional methods have been tested for the van der Waals interactions of the rare gas dimers He$\rm\sb2,\ Ne\sb2$ and Ar$\sb2$ as model compounds. Detailed analysis proved that all tested and commonly used ...
Cometary knots in the Helix Nebula
(1996)
The central star of the Helix Nebula, the closest planetary nebula, is ringed by hundreds of Cometary Knots. Presented here are images taken with WFPC2 of a field in the northern portion of the bright ring and some physical ...
Absolute differential and integral cross sections for charge transfer of state-selected keV oxygen ion with oxygen(2)
(1998)
Absolute differential and integral charge transfer cross sections have been measured for 0.5, 0.85, 1.5, 2.8, and 5.0 keV O$\sp+$ with O$\sb2$ at scattering angles between 0.01$\sp\circ$ and 3.50$\sp\circ$ in the laboratory ...
Evolution of trinucleotide microsatellite sequence variation across the Polistinae, a social wasp subfamily
(1998)
I examined sequences of 3 microsatellite loci that were derived from Polistes bellicosus investigated their evolution in 78 species from four tribes in the Polistinae subfamily of wasps. I found that the basic repeat ...
Pliocene-Pleistocene depositional sequences of the northern Gulf of Mexico, offshore Texas and Louisiana
(1994)
This work tests the consistency of sequence stratigraphic methods by comparing the model documented in this study with previous models for growth faulted, siliciclastic environments. Interpretations derive from sequence ...
A class of symmetric two dimensional logarithmic potentials
(1993)
This thesis discusses the solution of an elliptical conductor problem in two dimensions. This problem can be easily solved in higher dimensions, but in two dimensions, the potential function is logarithmic near infinity. ...