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Full-Text Articles in Physics

Tem Observations Of The Mechanism Of Delamination Of Chromium Films From Silicon Substrates, D. Goyal, Alexander H. King Feb 1992

Tem Observations Of The Mechanism Of Delamination Of Chromium Films From Silicon Substrates, D. Goyal, Alexander H. King

Alexander H. King

We have observed the complete delamination of polycrystalline chromium films from single crystal silicon substrates during deposition due to the formation of high internal stresses. These intrinsic stresses can give rise to interfacial defects which assist in the separation of the film from the substrate. Stresses in the film are balanced by stresses in the substrate, which cause mechanical failure in the substrate near the interface. Extensive arrays of dislocations and cracking of the substrate have been observed. We find that the delamination of the films from the substrate is initiated by the formation of damage in the substrate, rather ...


Evidence For Atomic Processes In Molecular Valence Double Ionization, U. Becker, Oliver Hemmers, B. Langer, A. Menzel, R. Wehlitz, W. B. Peatman Feb 1992

Evidence For Atomic Processes In Molecular Valence Double Ionization, U. Becker, Oliver Hemmers, B. Langer, A. Menzel, R. Wehlitz, W. B. Peatman

Environmental Studies Faculty Publications

Complete molecular valence-electron spectra were measured for CO. Unexpectedly, discrete lines at low kinetic energies were found, superimposed on a continuous energy spectrum representing direct double-ionization processes. The appearance of these lines is discussed in the context of the formation of the C++O+ ion pair near its associated threshold at 38.4 eV. It is ascribed to valence-excited repulsive (CO+)* states, which dissociate to a large part rapidly into atomic fragments before electronic relaxation takes place. From our spectra, partial cross sections for the different processes leading to dissociative valence double ionization are derived.


The Global Potential Energy Surfaces Of The Lowest Two 1a' States Of The Ozone Molecule: Theoretical Determination And Analysis , Gregory John Atchity Jan 1992

The Global Potential Energy Surfaces Of The Lowest Two 1a' States Of The Ozone Molecule: Theoretical Determination And Analysis , Gregory John Atchity

Retrospective Theses and Dissertations

The two lowest 1A[superscript]' potential energy surfaces (PES) of the ozone molecule are determined and analyzed using accurate ab-initio MCSCF calculations;As appropriate internal coordinates, the shape-scale perimetric coordinates for triatomic molecules are discussed and further developed;Because the previously determined intersection between these two surfaces of like symmetry is unusual, much of the present work involves this intersection. The relevant theory of intersections is reviewed, and a method for characterizing intersections according to the topology of the surfaces in their vicinity is developed;Furthermore, the reasons for this particular crossing in ozone are investigated. The analysis is based ...


Characterization Of Self-Assembled Carboxylate Monolayers And Multilayers At Copper And Silver , Earl Laird Smith Jan 1992

Characterization Of Self-Assembled Carboxylate Monolayers And Multilayers At Copper And Silver , Earl Laird Smith

Retrospective Theses and Dissertations

A variety of chemically modified surfaces were constructed by the self-assembly method via chemisorption onto evaporated metal films. Monolayer films, self-assembled from solution, include n-alkanoic acids, CH[subscript]3(CH[subscript]2)[subscript] nCOOH, and n-perfluoroalkanoic acids, CF[subscript]3(CF[subscript]2)[subscript] nCOOH, on copper, and n-alkanethiolates, CH[subscript]3(CH[subscript]2)[subscript] nSH on copper. Monolayer films were obtained from the gas phase, a newly developed technique, for n-alkanoic acids on silver, and n-alkanethiolates on silver and gold. Multilayer films obtained by self-assembly from the gas phase include n-alkanoic acids at copper and silver and perfluoroacids ...


Solid State Chemistry Of Some Polar Intermetallic Tetrelides Of The Rare-Earth And Alkaline-Earth Metals , Arnold Mejia Guloy Jan 1992

Solid State Chemistry Of Some Polar Intermetallic Tetrelides Of The Rare-Earth And Alkaline-Earth Metals , Arnold Mejia Guloy

Retrospective Theses and Dissertations

Syntheses of both binary M[subscript]5X[subscript]3 hosts and M[subscript]5X[subscript]3Z interstitial compounds with the same Mn[subscript]5Si[subscript]3 structure type was extended to rare-earth metal tetrelides. The variety of interstitials Z that were incorporated into these host binaries allowed the modulation of the bonding and properties of the host compound without greatly altering or breaking up the structure. Investigations on the binaries also revealed that both La[subscript]5Ge[subscript]3 and La[subscript]5Pb[subscript]3 exist in the Mn[subscript]5Si[subscript]3-type, and La[subscript]5Sn[subscript]3 exists ...