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 20 of 1777 for “"atom"”.
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Laserless slow atom source for loading atom traps
… magnets are used to selectively remove the fast atoms from an atomic beam and to guide the remaining slow atoms into a trapping region. The permanent magnets establish a quadrupole field which extends along the axis of a bent vacuum nipple. A threshold velocity is set by the radius of curvature …
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Rydberg atom diamagnetism
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1988.
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Nanocontacts controlled atom-by-atom in an ion-crystal friction emulator
… and energy dissipation. To test long-standing atomistic models of friction processes at the nanoscale, we implemented a synthetic nanofriction interface between a laser-cooled Coulomb crystal of individually addressable ions as the moving object and a periodic light-field potential as the …
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One-dimensional hydrogen atom
… spectrum of highly excited hydrogen atoms in the energy range between E = 0 and E = E$\sb{\rm c}$ ionization thresholds is examined in the presence of a strong dc electric field. Atomic hydrogen is excited from the ground state via a three-photon process to high-lying excited states. …
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One-dimensional hydrogen atom
… spectrum of highly excited hydrogen atoms in the energy range between E = 0 and E = Ec ionization thresholds is examined in the presence of a strong de electric field. Atomic hydrogen is excited from the ground state via a three-photon process to high-lying excited states. Detailed …
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Alkali-rare gas photodissociation lasers: applications to laser physics and atom-atom interactions
… simple platform with which to isolate and study atom-atom interactions and fundamental physical processes that are ill-understood or have never been investigated previously. Specifically, the minimum allowable energy separation between levels 2 and 3 in a three-level laser system has been …
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Atom-by-atom designs of metal oxide catalysts for the oxygen evolution reaction
… design, with billions of potential local atomic structures and active site environments. Therefore, this research combines machine learning, site-level descriptor approaches, and high-throughput virtual screening using density functional theory (DFT) to design optimal metal oxide catalysts …
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Quantum beating of rubidium: Interference between atomic coherences and long range atom-atom interactions
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Optimal Point Charge Approximation: from 3-Atom Water Molecule to Million-Atom Chromatin Fiber
Atomistic modeling and simulation methods enable a modern molecular approach to bio-medical research. Issues addressed range from structure-function relationships to structure-based drug design. The ability of these methods to address biologically relevant problems is largely determined by their …
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Towards an integrated atom chip
The field of atom chips is a relatively new area of research which is rapidly becoming of great interest to the scientific community. It started out as a small branch of cold atom physics which has quickly grown into a multidisciplinary subject. It now encompasses topics from fundamental atomic and …
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Cavity modified atom-photon interaction
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Atom-by-Atom Substitution of Transition Metals in GaAs and Visualization of Hole-Mediated Interactions
… interactions. In this thesis, we present a novel atom-by-atom substitution technique with the scanning tunnelling microscope (STM) to controllably incorporate transition metal dopants into GaAs. We compare the electronic states of isolated single acceptors in an identical configuration - Ga sites …
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Atom-by-Atom Substitution of Transition Metals in Gallium Arsenide and Visualization of Hole-Mediated Interactions
We also present the first controlled atomic scale study of the interactions between isolated Mn impurities mediated by electronic states in GaAs. High-resolution STM measurements provide visualization of the GaAs electronic states that participate in Mn-Mn interactions. We quantify the interaction …
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The entities which constitute the atom
Thesis (M.A.)--Boston University, 1935. This item was digitized by the Internet Archive.
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Numerical methods for cold atom systems
… degenerate regimes in dilute ultracold atomic alkali-gases. In these dilute systems, interactions are characterized by a single parameter, the s-wave scattering length. In this dissertation, we review the physics of quantum degenerate atomic gases from a theoretical perspective and …
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