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 40 for “"High resolution spectroscopy"”.
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High-resolution spectroscopy of propargyl radical
The high resolution infrared spectrum of the $\nu\sb1$ acetylenic CH stretch of the propargyl radical H$\sb2$CC$\equiv$CH has been obtained by the color center laser kinetic spectroscopy method. The propargyl radical is produced by flash photolyzing stable precursors propargyl bromide or propargyl …
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High resolution spectroscopy of photospheric bright points
… <br>MHD simulations have usually much better resolution that observational data, so advanced observational techniques need to be applied to compare them. <br> <br> Speckle reconstruction techniques are widely used to improve the quality of ground-based solar observations. To date, there have …
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High-resolution spectroscopy of very active solar-type stars
Previous low-resolution spectroscopy has been used to find stars with highly active chromospheres within 50 pc of the Sun for the Northern hemisphere. We have analyzed thirteen such stars, using high-resolution spectroscopy, to determine Lithium abundances and metallicities. Although two of these …
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High resolution spectroscopy of some gaseous transition metal containing diatomic molecules
… nitride (NbN) have been recorded at sub-Doppler resolution by intermodulated laser-induced fluorescence. The C³Π and e¹Π states, which belong to the same electron configuration (4dδ)¹(4dπ)¹, interact strongly with each other by a second-order spin-orbit/Fermi contact mechanism; the structure of …
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High resolution spectroscopy of the Vanadium oxide B⁴ [pi] -X⁴ [sigma] ⁻ (0,0) Band
… band of VO has been recorded at sub-Doppler resolution by intermodulated fluorescence spectroscopy. Spectral linewidths of 60 MHz were typical; which enabled the hyperfine structure due to the ⁵¹V nucleus (I = 7/2) to be resolved for most of the observed branches. The hyperfine structure of …
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Development of a quantum cascade laser based spectrometer for high-resolution spectroscopy of gas phase C60
… of an infrared band of C60 around 8.5 μm. A high-resolution spectrum will be valuable from an applied astronomy and fundamental spectroscopy perspective. While there have been astronomical detections of C60 emission from thermal emission or UV-excitation, a gas phase laboratory spectrum would …
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Hochauflösende Spektroskopie gespeicherter Indium Ionen
… ion as well as for a two-ion coulomb-crystal. In high-resolution spectroscopy the narrow-bandwidth clock-transition was measured with a resolution of 1,3*10^(-13). The absolute frequency of this transition was measured with an uncertainty of 1,8*10^(-13). Also the properties of the Indium-Ion as a …
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Fourier Transform Infrared Spectroscopy for the measurement of GeSn/(Si)GeSn
… were limited by issues bordering on low spectral resolution, spectral artifacts, and poor signal-to-noise ratio (SNR) thereby resulting in the possible loss of vital information and inaccurately reported parameters.</p> <p>To maintain the progress of the GeSn material development toward replacing …
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X-ray searches for decaying sterile neutrinos with the Micro-X and XQC sounding rockets
… decay, but requires more observations with high-resolution spectroscopy to fully explore the nature of the line. In the first half of this thesis, we present the results from a search for a similar unidentified line, using data from the X-ray Quantum Calorimeter (XQC) sounding rocket.
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The Origins and Environments of Quasar Absorption Lines in the Sloan Digital Sky Survey
… large scale structure of baryonic matter in the high-redshift universe; yet many critical questions regarding the origins and environments of QALs still remain. Absorption along the line of sight to quasars is believed to probe a wide variety of physical processes, including relativistic quasar …
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High-resolution infrared spectroscopy of large molecules and water clusters using quantum cascade lasers
High-resolution infrared spectroscopy is a powerful tool for obtaining detailed information about molecules and molecular clusters. This dissertation presents several high-resolution spectroscopic studies of large molecules and water clusters which have been obtained using a quantum cascade laser …
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Application of Carbon Dioxide Waveguide Lasers to Infrared Saturation Spectroscopy
… development of tunable lasers has made possible spectroscopy at a resolution previously unattainable. Although continuous-wave broadly tunable sources in the 10 pm region do not yet exist , waveguide carbon dioxide lase r s offer a useful tunability about a large number of emission lines in this …
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Optical Excitation of Metastable Krypton and Photoassociative Spectroscopy of Ultracold RbAr
… methods to produce metastable-state krypton. The high energies required to excite rare gases out of their ground state present a unique challenge in the context of laser experiments. Laser physics work with rare gases often relies on excitation within an RF discharge. All-optical excitation is a …
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New techniques for sub-Doppler spectroscopy of molecular ions
… in developing new methods for performing high-resolution sub-Doppler spectroscopy of molecular ions in the laboratory. Molecular ions are of interest to a variety of fields, from astrochemistry to fundamental physics to the study of chemical reactive intermediates. The limiting factor in …
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Coherent control of Rydberg atoms using sub-kHz linewidth excitation lasers
… wave lasers stabilised simultaneously on a ultrahigh finesse Ultra-low-expansion (ULE) cavity, providing long-term stability and sub-kHz linewidth lasers with a tunable offset-lock frequency as required for high fidelity quantum operations. High-resolution spectroscopy on a cloud of cold Cs atoms …
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High-resolution studies of charge exchange in supernova remnants with Magellan, XMM-Newton, and Micro-X
… optical study, performed using both imaging and high resolution spectroscopy from the IMACS instrument on the Magellan Baade Telescope at Las Campanas Observatory, seeks to identify 'Balmer-dominated shocks' in the remnant, which signal the occurrence of charge exchange between hot, postshock …
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Signatures of the first stars in relics of the first galaxies
… with the first heavy elements, and they produced high energy photons that reionized the intergalactic medium. Understanding this early era is at the frontier of modern astrophysics and cosmology, but it takes place so long ago that direct observations are challenging. An alternate approach is to …
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Search for post-starburst (E+A) galaxies in the cluster Abell 3266
… and age of this merger remain uncertain. Low resolution, fiber spectra of galaxies in Abell 3266 were analyzed and searched for "E+A" (post-starburst) galaxies, from which we selected two candidate "E+A" galaxies for follow-up high-resolution spectroscopy. The 2 candidate galaxies are …
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