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 64 for “"strong-field"”.
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Probes of strong-field gravity
… investigate several ways to probe gravity in the strong-field regime. These investigations focus on observables from the gravitational dynamics, i.e. when time derivatives are large: thus I focus on sources of gravitational waves. Extreme mass-ratio inspirals (EMRIs) can be very sensitive probes …
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Strong-field physics with ultrafast optical resonators
Light fields from modern high-intensity, femtosecond laser systems can produce electrical forces that rival the binding forces in atomic and solid-state systems. In this strong-field regime, conventional non-linear optics gives way to novel phenomena such as the production of attosecond bursts of …
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Strong Field Ionization Of Radicals And Reaction Intermediates
<p>This work presents results of adapting SFI probe for detection of radicals and their isomers. Radicals and reaction intermediates were produced using an established method flash pyrolysis. This combination allows for new insight in studying radicals and provide complementary results to the other …
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Fundamental Studies And Applications Of Strong Field Ionization
<p>In an intense laser field, atoms and molecules experience tunneling ionization directly to the continuum. We used this method to study several aspects and applications of strong field ionization (SFI) in atoms and molecules. One study used SFI to probe the photofragments produced by …
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Quantum Dynamics of Strong Field Light-Matter Interactions
… models for the light-matter interactions in the strong-field regime. These investigations provided us with valuable insights into long-debated problems related to quantum tunneling, namely, the quantum tunneling time and momentum i.e., the ongoing debate in the literature about how much time a …
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Strong-field Phenomena in Low-dimensional Materials at Terahertz Frequencies
… substantial fraction of their energy in a single field oscillation cycle has opened a new era in the experimental investigation of strong light-matter interactions in solids, motivated by the quest for the ultimate frontiers of all-optical controls. Exploring ways to approach those frontiers …
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TOWARDS PROBING THE STRONG FIELD GRAVITY USING BINARY BLACK-HOLE RINGDOWNS
… hole ringdowns as a probe to understand the strong-field clssical gravity. When two black holes merge, they form a single distorted black hole that then radiates gravitational waves and settles into a final stable Kerr state. The signal produced during this process is called the ringdown and …
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Nuclear magnetic resonance microscopy using strong field gradients and constant time imaging
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Engineering strong-field phenomena : from attosecond pulse characterization to nanostructured electron emitters
Strong-field phenomena are a driving force behind the latest innovations in ultrafast science. As ultrafast laser sources improve in terms of peak pulse energy and wavelength tunability, applications that utilize high peak electromagnetic field strengths to generate attosecond pulses of both …
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Studies of strong-field gravity : testing the black hole hypothesis and investigating spin-curvature coupling
… to date we have only tested gravity in the weak-field limit. In the next few years, observational advances may make it possible for us to observe motion in the strong field for the first time. This thesis is concerned with two probes of strong-field gravity: whether the spacetime of a black hole …
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Developing A Toolbox To Probe Reaction Dynamics With Strong Field Ionization And Non-Linear Attosecond Spectroscopy
… related to the laser matter interaction: strong field ionization and nonlinear attosecond spectroscopy. The first part is based on the studies related to the strong field ionization probe. Strong field ionization probe was verified to be sensitive to the sign of magnetic quantum number …
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Applications of electronic structure theory to problems in strong-field chemistry, inorganic chemistry, and nanomaterial systems
… of electronic structure theory to various fields of chemistry and is divided into eight chapters. Chapters 2 through 4 describe a series of related works which explore applications of excited state electronic structure methods to problems in strong field chemistry. Chapters 5, 6, and 7 …
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A classical view of the quantum vacuum
… up to experimental study for the first time: the strong-field regime. Under the influence of strong electromagnetic fields, virtual particles in the quantum vacuum become polarised, and wave propagation in regions of strong field becomes nonlinear.This Thesis explores this regime using nonlinear …
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Exploring gravity
… in most astrophysical interactions. Weak-field interactions have been extensively studied, but the strong-field regime remains largely unexplored. Gravitational waves (GWs) are an excellent means of accessing strong-field regions. We investigate what we can learn about both astrophysics …
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High-energy sub-cycle optical waveform synthesizer
… of atomic-scale electronic motion by optical fields strong enough to mitigate the atomic Coulomb potential, has broken tremendous new ground with the advent of phase controlled high-energy few-cycle pulse sources. In particular, broadband optical parametric chirped pulse amplifier (OPCPA) has …
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Testing general relativity using millimeter wavelength radio interferometry of Sgr A*
… relativity, though widely accepted in the weak-field limit, is difficult to test in the strong-field regime. Millimeter wavelength VLBI offers a unique opportunity to resolve the black hole structure on event-horizon scales. The ability of millimeter wavelength VLBI observations of Sgr A* to …
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Synthesis, characterization, and catalytic reactivity of first-row transition metal CCC pincer complexes
… to engage in the desired reactions is to use strong-field ligand frameworks. Strong-field ligands cause the d-orbital splitting of the metal center to increase in energy, often leading to low-spin electronic configurations which favor two-electron reactivity. N-heterocyclic carbenes (NHCs) are …
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Scaling of ultrafast photon-triggered field emission cathodes composed of arrays of sharpened single-crystal Si pillars
… limits of ultrafast photon-triggered field emission cathodes composed of arrays of nano-sharp high-aspect-ratio silicon pillars. We are interested in exploring how the geometry of the array and the morphology of the pillars affect the emission of the electrons. Both the multi-photon …
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From Measure Zero to Measure Hero: Periodic Kerr Orbits and Gravitational Wave Physics
… from planetary orbits is not allowed in the strong-field regime. Instead, eccentric orbits trace out precessions of multi-leaf clovers in the final stages of inspiral. Furthermore, for any black hole, there is some orbital angular momentum value in the strong-field regime below which …
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Liquid metal brushes for homopolar devices
… a fixed surface and a moving surface, with a strong applied magnetic field and with a free surface beyond each moving end of the gap. The radial and axial velocities in the secondary flow are reduced by a strong axial or radial magnetic field. For a sufficiently strong field, the azimuthal …
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