Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Interatomic interactions"”.
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Long-range interatomic interactions: Oscillatory tails and hyperfine perturbations
… the retardation regime is achieved when the interatomic distance, R, is larger than 137 a₀, where a₀ is the Bohr radius.</p> <p>To study the interaction between two hydrogen atoms in 1S and 2S states, we differentiate three different ranges for the interatomic distance: van der Waals range …
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Interatomic interactions and dynamics of atomic and diatomic lattices
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1982.
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A cold strontium Rydberg gas
… in which to study the novel effects of strong interatomic interactions. This thesis describes the design and construction of the world's first experiment to study Rydberg states in a cold gas of an alkaline earth metal, in this particular case strontium. We have studied a wide range of Rydberg …
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A new apparatus for experiments with Caesium Bose-Einstein Condensates
… Caesium condensates offer excellent control over interatomic interactions due to the rich landscape of low-field magnetic Feshbach resonances, which enables the study of quantum gases in attractive and repulsive interaction regimes. An ultra-high vacuum system, laser systems and magnetic field …
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A multiscale framework for structure of confined water and electrolytes
… statistical mechanics tools to incorporate interatomic interactions, long-range electrostatics, molecular correlations, and polarization effects at a continuum-level. Explicit consideration of atomic interactions of water molecules is both theoretically and numerically challenging. We …
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Few- and Many-body Physics with Strongly Interacting Bose Gases
… potential. We focus on the regime of strong interatomic interactions in the vicinity of scattering (Feshbach) resonances, and our experiments probe both equilibrium physics and post-quench dynamics. The thesis explores three main topics, focusing in turn on two-, three- and many-body physics. …
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Second Order Interactions in Solid State Systems
Non-covalent interatomic interactions, particularly hydrogen bonds, have been studied through systematic analysis of published crystallographic data, and through the determination of novel crystal structures. Chapters 1-3 give relevant background on crystal structure analysis and describe the …
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Nonlinear dynamics of a matter-wave soliton in driven potentials
… from a Bose-Einstein condensate with attractive interatomic interactions, confined by a one dimensional harmonic or double-well trapping potential, and subject to weak periodic driving. Such systems have potential applications in metrology, specifically in the use of atom interferometers for high …
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Nonlinear dynamics of a matter-wave soliton in driven potentials
… from a Bose-Einstein condensate with attractive interatomic interactions, confined by a one dimensional harmonic or double-well trapping potential, and subject to weak periodic driving. Such systems have potential applications in metrology, specifically in the use of atom interferometers for high …
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Topics in the Theory of Bose -Einstein Condensates With a Spin Degree of Freedom
… the literature is that this one is not caused by interatomic interactions, but rather by the constraint on the total spin of the system. We investigate the consequences of performing the experiment in a toroidal trap, and we find that, under certain conditions, the system spontaneously builds up a …
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Structural heterogeneity in silk fibers and its effects on failure mechanics and supercontraction
… system. It is shown that the consideration of interatomic interactions alone cannot explain the fracture strength observed in biological fibers. Instead, structures at multiple length-scales must be considered to explain the remarkable mechanical performance and resilience of silk. Third, the …
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Bridging the gap between atomistic and continuum models to predict dielectric and thermodynamic properties of confined fluids
… models by incorporating molecular correlations, interatomic interactions, and anisotropic effects at a continuum level. We show that EQT can be used in classical density functional theory to predict the thermodynamic properties for confined fluids. Moreover, we present a hierarchical coarse-grain …
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First Principles Method for Complex Cement Structure and High Entropy Alloys
… and water content. Detailed analysis of interatomic bonding shows the similarities and subtle difference between them even though thaumasite has the Si tetrahedron as the backbone unit in contrast to ettringite with Al-columns and no Si atoms. Moreover, thaumasite has strong C–O bonds …
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Biophysical Studies of Protein Assemblies
… chains. The subtle energetic interplay of interatomic interactions results in chain folding, through which proteins may acquire defined structures. This spatial organisation is encoded by the protein sequence itself; the so-called thermodynamic hypothesis formulated by Anfinsen in 1961. A …
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Elasticity measurements at extreme conditions: application to FeO and FeNi-alloy
… because elastic tensors reveal the nature of interatomic interactions. In order to determine the full elastic tensor of minerals under high pressure and temperature, several techniques are available, including ultrasonic interferometry and inelastic x-ray scattering methods. One of the most …
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Quantum liquid crystal phases and unconventional magnetism in electronic and atomic fermi systems
… and itinerant Fermi systems with dipole-dipole interactions. It is based on published works of Refs. [65, 193, 68, 67, 66]. In the first part of the Thesis, I present the construction of a generalization of the the McMillan- de Gennes theory of nematic-smectic thermal phase transition of …