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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 15 of 15 for “"resonant absorption"”.
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Exact Analysis of Hot Electrons Produced by Resonant Absorption in Laswer-Plasma Interaction
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Nuclear resonance fluorescence in Si²⁸
… energy of the ground state games available for absorption. The energy deficit which appears in emission and absorption is made up by the kinetic energy of the compound nucleus recoiling from the proton bombardment. Variation of the angle between the collimator and the proton beam allows the …
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Narrowband Photodetection in the Short-wavelength Infrared with a Plasmon-induced Hot Electron Device
… slits in a metal film, resulting in a strong, resonant absorption whose frequency is determined by the nanostructure periodicity. When a grating is patterned on a silicon substrate, the absorption response can be combined with plasmon-induced hot electron photocurrent generation. This yields a …
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Photon scattering from 40Ca and 39K up to 14 MeV
… to a single line, and angular distribution and resonant absorption experiments were done on it. Nuclear resonance fluorescence was measured up to 9.5 MeV in both 39K and 40Ca using a Ge(Li) detector. Elastic scattering was seen from twelve levels in 40Ca and from seventeen levels in 39K. …
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A Semi-Analytical Line Transfer (SALT) Model For Bi-conical Galactic Outflows
… as generalized velocity fields. We model the absorption and emission component of the line profile resulting from resonant absorption in the bi-conical outflow. We show how the outflow geometry impacts the resulting line profile. We use simulated spectra with different geometries and velocity …
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The design and construction of a constant acceleration drive system for Mössbauer experiments
… a similar nucleus and will, therefore, not by resonantly absorbed due to the fact that the natural linewidth of the gamma ray is so much smaller than the energy taken by the emitting atom and the similar energy needed by the absorbing atom.</p><p>In 1958 a new effort in the emission and …
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Measurement and Analysis of High Frequency Resonances In Printed Circuit Boards
… vias, periodic materials, contaminant resonant absorption, and water/moisture.</p>
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Coupled phenomena in arrays of microplasma devices and microchannel plasma devices as antennas
… is attributed to electron heating driven by the resonant absorption of scattered radiation. The transition from Townsend-like discharges to abnormal glow-like discharges was observed in arrays of microcavity plasma devices. During the transition, bistable oscillations of visible emission were …
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Quasar spectroscopy in UV and X-ray- probing the intergalactic medium using helium and oxygen
… redshift (z [approx.] 2) using the strongest resonant absorption lines of neutral hydrogen ([lambda]HI = 1215.67 A[ngstroms]) and neutral helium ([lambda]HeI = 584.33 A[ngstroms]). We calculate the fraction of neutral helium in the IGM at z [approx.] 2 by solving a set of photoionization …
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Optomechanical Devices and Sensors Based on Plasmonic Metamaterial Absorbers
Surface plasmon resonance is the resonant oscillations of the free electrons at the interface between two media with different signs in real permittivities, e.g. a metal and a dielectric, stimulated by light. Plasmonics is a promising field of study, because electron oscillations inside a …
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Identification and Characterization of the Iron-Zinc Intermetallics Formed in Galvanneal steel
… from the galvanneal coatings following the resonant absorption of a γ-ray. The detector probes the full coating depth allowing the complete coating composition to be determined.</p> <p>Finally, the database of the crystallographic and hyperfine parameters of the iron-zinc intermetallics …
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Photodetection using ultrathin metal films
… and solar cells. However, silicon's lack of absorption in the infrared limits its use in infrared detectors and imaging sensors, severely constraining its implementation in telecommunications for low-cost integrated optical circuitry. In this thesis, we show that this limitation can be …
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A novel equivalence method for high fidelity hybrid stochastic-deterministic neutron transport simulations
… sections, which lead to an over-estimation of resonant absorption rates, especially for the lower resonances of ²³⁸U. This thesis presents a novel equivalence method based on introducing discontinuities in the track angular fluxes, with a polar dependence of discontinuity factors to preserve …
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MATERIALS CHARACTERIZATION FOR SUB-MICRON SUPERCONDUCTING INTERCONNECTS IN RECIPROCAL QUANTUM LOGIC CIRCUITS
… from two-level system tunneling relaxation and resonant absorption processes. %Estimates of peak currents and voltages are used to %A loss spectroscopy method is presented as a tool to The work in this dissertation describes the development of methods to aid in characterization, design, and …
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X-Ray studies of the physics of matter around super-massive black-holes in nearby Seyfert galaxies
… emission line component. Finally, blueshifted resonant absorption lines have been detected in all three objects. This seems to demonstrate that, around super-massive black-holes, there is matter which is not confined in the accretion disk and moves along the line of sight with velocities as …