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 81 for “"Single Atom"”.
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Single atom detection in low finesse cavities
… für die Integration mikrooptischer Elements auf Atomchips. Dies beinhaltete theoretische und experimentelle Untersuchungen zur Möglichkeit der Detektion einzelner Atome mit Hilfe von optischen Resonatoren niedriger Güte. Hierfür wurde ein theoretisches Model zur Beschreibung des gekoppelten …
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Single atom imaging with time-resolved electron microscopy
… possibilities for time-resolved imaging at the atomic scale. However, rapid imaging of single atom dynamics brings with it a new set of challenges, particularly regarding noise and the interaction between the electron beam and the specimen. This thesis develops a set of analytical tools for …
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Single-atom imaging of 40K atoms via raman sideband cooling
… cooling and imaging of fermionic potassium atoms in optical lattice potentials. Our experiment is capable of cooling 40K atoms to a T /TF of 0.18, well into the degenerate Fermi-gas regime. We then load the atoms into a 3D optical lattice and prepare ∼ 500 atoms in one anti-node of the …
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High-fidelity microwave control of single-atom spin qubits in silicon
… demonstration of the full operation of single-spin qubits in Si. Our qubits consist of the electron and nuclear spins of a single phosphorus atom, implanted in a Si substrate, and controlled by a gated nanostructure. We describe an experimental setup tailored to minimise electron …
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Optimizing Iridium Single Atom and Small Cluster Catalysts for CO Oxidation
Single atom catalysis is a relatively new form of heterogeneous catalysis. While single atom catalysts probably are already used in a lot of catalysis, their identification and characterization has only recently become common place. As we now have the ability to synthesis relatively pure systems …
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Thioamides And Proteolysis: Examining The Effects And Applications Of A Single-Atom Substitution
Thioamide substitution in the peptide backbone enables several applications in studying proteolysis, monitoring protease activity and in selective protease inhibition. To date, we have used model substrates to investigate the positional effects that these thioamide substitutions have on proteolysis …
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Velocity selection to enable direct measurement of strong single atom-optical cavity coupling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.
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Synthesis and Catalytic Applications of Ni-Based Single-Atom and Nanoparticle Catalysts Supported on UiO-66-NH2
Nowadays, with the advancement of industrial productivity, air pollution has become a shared concern globally. One of the most discussed topics in this field is the recycling and utilization of industrial exhaust gases, particularly the high-value utilization of carbon dioxide emissions. In this …
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The optimization and analytical characterization of super cavity mirrors for use in the single atom laser experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Revealing Structural and Spin-state Dependent Reactivity of Single Atom Catalysts (SACs) with Systematically Improvable Computational Tools
… reaction (ORR) important for fuel cells. Single-atom catalysts (SACs), particularly doped graphitic catalysts, have emerged as a promising class of materials. SACs combine the advantages of homogeneous and heterogeneous catalysts, offering tunable active sites and scalability. However, …
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Uptake and Reaction Mechanisms of CO, H2O, and the Nerve Agent Simulant, DMMP with Single Atom-Modified Zirconium-based Metal-Organic Frameworks
… improve the protective capabilities of Zr-MOFs, single atoms of various transition metals have been deposited at the Zr-based nodes for prevention of irreversible binding of degradation products, based on previous computational studies that suggest single atoms form weaker, monodentate bonds to …
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Structural and mechanistic identification of heterogeneous catalysts
… and enable more sustainable processes. Atomically disperse or single atom catalysts have shown particular promise for their ability to exceed nanoparticle catalysts with regards to activity, stability and selectivity for a growing number of chemical reactions. Understanding key …
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State-selective imaging of single rubidium atoms in a solid neon matrix
The development of single-spin quantum sensors with nanoscale resolution would provide immense utility in the determination of molecular structure, with applications in fields such as biology and chemistry. This dissertation discusses our progress toward using rubidium atoms trapped in solid neon …
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Metal–organic framework based non-precious metal electrocatalysts for the oxygen reduction reaction
… can play a role in activating surface carbon atoms leading to the cleavage of the OOH bond, a key step in the ORR. In the second part of this thesis, the use of cadmium as a sacrificial metal instead of the widely-used zinc is presented. The use of cadmium allows for the synthesis of an active …
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A single-site resolution fermionic quantum-gas microscope
… enable direct probing of local quantities by single-atom-resolved detection in optical lattices. Recent years have seen many fascinating results from the bosonic quantum-gas microscopes using 87Rb. However, no such device existed for fermionic species.;The goal of this thesis work was to …
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Forward Light Scattering in an Extended Sample of Cold Atoms
… results on the forward emitted light from a cold atomic sample of 87Rb. Specifically,we study single-photon superradiance which is characterized by a rapid decay faster than the single atom lifetime with the light preferentially emitted in the forward direction. Additionally, we report …
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Modelling and Exploiting the Hyperfine Structure of Alkali Atoms for Generation of Nonclassical Light and Rydberg-Atom-Based Field Sensing
Alkali atoms are a workhorse in quantum optics, owing to the relative simplicity of their elec- tronic structure, which affords remarkable and reliable control over their behaviour. In particular, the ability to probe and manipulate alkali atoms with electromagnetic fields provides an important …
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In Situ High-Temperature Scanning Tunneling Microscopy Studies of Early Stage Growth Kinetics During Titanium Nitride Epitaxy
… of my research, I have developed methods to grow atomically-smooth TiN(001) and (111) single-crystal layers with simple well-defined single-atom-high 2D island configurations on large atomically-smooth terraces. I used in situ scanning tunneling microscopy to study time- and temperature-dependent …
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Progress towards strong coupling between collisionally blockaded atoms and an optical cavity
… in which to probe the interactions between an atom and a single photon light field. I discuss the relevant technical considerations and many of the physical phenomena that can be tested with this particular experimental system. In particular, I discuss the design, implementation, and control of …
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Direct oxidation of methane to methanol
… The effect of molecules coordinating to the single atom centre on the reaction mechanism is explored. CO has a considerable effect as a ligand, explaining the experimental requirement for CO to have a trace presence in the system. Despite water also being required experimentally, a minimal …
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