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Synthesis and characterization of metal--metal bonded dimers of tantalum and tungsten
A search for innovative synthetic routes to new metal-metal bonded metal-halide clusters resulted in isolation of two completely independent dimeric species. The syntheses and characterizations of Ta/sub 2/X/sub 6/(SC/sub 4/H/sub 8/)/sub 3/ (X = Cl, Br) and ((n-C/sub 3/H/sub 7/)/sub 4/N)/sub 2/(W/sub 2/Br/sub 9/) followed entirely different experimental routes, yet occasionally similar properties linked the two projects. (auth)
Date:
December 1, 1975
Creator:
Templeton, J. L.
System:
The UNT Digital Library
Comparison between phase shift derived and exactly calculated nucleon--nucleon interaction matrix elements. [Tables]
A comparison is made between matrix elements calculated using the uncoupled channel Sussex approach to second order in DWBA and matrix elements calculated using a square well potential. The square well potential illustrated the problem of the determining parameter independence balanced with the concept of phase shift difference. The supersoft core potential was used to discuss the systematics of the Sussex approach as a function of angular momentum as well as the relation between Sussex generated and effective interaction matrix elements. In the uncoupled channels the original Sussex method of extracting effective interaction matrix elements was found to be satisfactory. In the coupled channels emphasis was placed upon the /sup 3/S/sub 1/-/sup 3/D/sub 1/ coupled channel matrix elements. Comparison is made between exactly calculated matrix elements, and matrix elements derived using an extended formulation of the coupled channel Sussex method. For simplicity the potential used is a nonseparable cut-off oscillator. The eigenphases of this potential can be made to approximate the realistic nucleon-nucleon phase shifts at low energies. By using the cut-off oscillator test potential, the original coupled channel Sussex method of determining parameter independence was shown to be incapable of accurately reproducing the exact cut-off oscillator matrix elements. The …
Date:
January 1, 1975
Creator:
Gregersen, A. W.
System:
The UNT Digital Library
Spectroscopy of transition metal species in rare gas matrices. I. Vanadium metal. II. Sulfides. III. Carbonyl complexes. IV. Dinitrogen complexes. V. Homonuclear diatomic compounds
None
Date:
October 1, 1975
Creator:
DeVore, T. C.
System:
The UNT Digital Library
Formal analysis of name accessing in programming languages. [R]
None
Date:
October 1, 1975
Creator:
Smith, C. L.
System:
The UNT Digital Library
Temperature dependence of resistivity of thin film samples of chalcogenide glasses
None
Date:
October 1, 1975
Creator:
Kulkarni, A. K.
System:
The UNT Digital Library
Magnetic excitations above the critical temperature
None
Date:
October 1, 1975
Creator:
Swanson, P. A.
System:
The UNT Digital Library
Multiconfiguration self-consistent field method for many-electron systems and its application to the dissociation of ethylene
None
Date:
October 1, 1975
Creator:
Cheung, L. M.
System:
The UNT Digital Library
Electroreflectance of single crystal metals
None
Date:
December 1, 1975
Creator:
Furtak, T. E.
System:
The UNT Digital Library
Peripheral nucleon--antinucleon production by 13 GeV/c pions
None
Date:
April 30, 1975
Creator:
Dulude, R. S. & Gaidos, J. A.
System:
The UNT Digital Library
Thermodynamic study of phase stability in the thorium--copper equilibrium system
None
Date:
February 1, 1975
Creator:
Bailey, D. M.
System:
The UNT Digital Library
Superconductivity and the Kondo effect in quench-condensed films containing cerium
None
Date:
February 1, 1975
Creator:
Delfs, R.J.
System:
The UNT Digital Library
Radiochemical studies of some low- and medium-energy nuclear reactions produced by accelerated tritons, deuterons, and protons
None
Date:
January 1, 1975
Creator:
Casella, V.R.
System:
The UNT Digital Library
Pi-meson absorption on the deuteron
None
Date:
January 1, 1975
Creator:
Goplen, B.
System:
The UNT Digital Library
High temperature deformation behavior of cemented carbide cutting tools
None
Date:
January 1, 1975
Creator:
Baldoni, J.G. II
System:
The UNT Digital Library
Effect of hydrogen on the creep properties of vanadium, niobium, and molybdenum
None
Date:
February 1, 1975
Creator:
Mather, J.C.
System:
The UNT Digital Library
Study of the reaction $pi$$sup -$p $Yields$ eta n in the region of the N*(1688)
None
Date:
March 25, 1975
Creator:
Chaffee, R.B.
System:
The UNT Digital Library
Quantities of actinides in nuclear reactor fuel cycles
None
Date:
April 1, 1975
Creator:
Ang, K.P.
System:
The UNT Digital Library
Single atom imaging in high resolution electron microscopy
None
Date:
1975~
Creator:
Chiu, W.
System:
The UNT Digital Library
Isotope Separation by Laser Deflection of an Atomic Beam
None
Date:
February 1, 1975
Creator:
Bernhardt, A. F.
System:
The UNT Digital Library
CARBON-13 NMR STUDIES OF LIQUID CRYSTALS
High resolution, proton decoupled {sup 13}C nmr are observed for a series of neat nematic liquid crystals, the p-alkoxyazoxybenzenes, and a smectic-A liquid crystal, diethylazoxydibenzoate in a magnetic field of 23 kG. The (uniaxial) order parameters S = <P{sub 2}(cos{theta})> are found to be about 0.4 and 0.9 for the nematic and smectic-A phase respectively at the clearing points. The order parameter increases with decreasing temperature in the nematic phase but is constant, or nearly so, with temperature in the smectic-A phase. In the nematic series studied, the ordering exhibits an even-odd alternation along the series and qualitative agreement with a recent theory due to Marcelja is found. In both phases, the spectra show that the molecule rotates rapidly about its long axis. Tentative conclusions about molecular conformational motion and {sup 14}N spin relaxation are presented for both nematic and smectic-A phases. In the smectic-A phase, the sample is rotated about an axis perpendicular to H{sub 0} and the resulting spectra are discussed. The theory of observed chemical shifts in liquid crystals is treated in an appendix. Equations are derived which relate the nmr spectra of liquid-crystals to the order parameters. A model for the smectic-C phase due to Luz …
Date:
June 1, 1975
Creator:
Allison, Stuart
System:
The UNT Digital Library
Simulation and control synthesis for a pulse column separation system for plutonium--uranium recovery
None
Date:
May 1, 1975
Creator:
McCutcheon, E. B.
System:
The UNT Digital Library
Extraction of metal ions with N, N-disubstituted amides
None
Date:
July 1, 1975
Creator:
Orf, G.M.
System:
The UNT Digital Library
Structure of strong shock waves with implications for deuterium synthesis in supernovae
None
Date:
May 1, 1975
Creator:
Weaver, T. A.
System:
The UNT Digital Library
Nonequilibrium, two-phase critical discharge of nearly saturated and subcooled CCl$sub 3$F through short tubes
None
Date:
February 1, 1975
Creator:
Prisco, M.R.
System:
The UNT Digital Library