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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 11 of 11 for “"cavity-ringdown"”.
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… for radiation-induced atmospheric effects. Cavity Ringdown Spectroscopy (CRDS) was used to measure the concentration of chemical products generated as a result of radiation interactions in a controlled atmosphere. Experiments were conducted in a vacuum chamber interfaced with a gas …
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High-resolution spectroscopic studies of carbon-containing species
… Work to this end was performed using cavity-ringdown spectroscopy and either a gas phase or supercritical fluid supersonic expansion source. Future work will focus on optimizing the supercritical fluid source, in addition to setting up a positive column for the study of molecular ions. …
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A System for Measuring Radiation Induced Chemical Products in Atmospheric Gases Using Optical Detection Methods
… This project explored the potential for using Cavity Ringdown Spectroscopy to evaluate the presence of chemical products generated by the air-radiation interaction near an alpha radiation source. In particular, measurements of ozone concentration within a controlled atmosphere chamber as …
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A System For Conducting Laser-Induced Fluorescence Measurements On Gas Mixtures Exposed To Alpha Radiation
… limited to those which can be detected utilizing cavity ringdown spectroscopy. The current model indicates nitric oxide and ozone to be the primary reactants that dictate production rates and concentrations for many of the resulting chemical products. Because strong absorption cross sections for …
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Ab initio Calculations of Optical Rotation
… been compared to recently published gas-phase cavity ringdown polarimetry data. When applicable, well-converged Gibbs free energy differences among confomers were determined using complete-basis-set extrapolations of CC energies in order to obtain Boltzmann-averaged specific rotations. The …
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Application of sensitive spectroscopic techniques to intramolecular dynamics and combustion kinetics
Modifications of Cavity Ringdown Spectroscopy (CRD) for use in the UV region are discussed. These modifications partially overcome the low sensitivity of CRD in the UV (due to lower mirror reflectivity, R - 0.99) by removal of non-exponential contributions to the ringdown decay. We have also …
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High-resolution infrared spectroscopy in pursuit of C60 and other astrochemical targets
… concerned with the development of a mid-infrared cavity ringdown spectrometer with the intent of observing rotationally-resolved vibrational spectra of C60 and other astronomically relevant molecules, including the polyoxymethylene 1,3,5-trioxane. C60 was first discovered during experiments …
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Emissões de CO2 , particionamento da respiração e qualidade da matéria orgânica em solos sob cultivo de eucalipto no Cerrado
… foram realizadas por meio do parelho cavity ringdown laser spectroscopy (CRDS). A umidade e a temperatura do solo foram medidas por ocasião das coletas nas época seca e época chuvosa. O cálculo utilizado para particionamento da respiração foi o proposto por Millard et al. (2010). No …
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Development of a quantum cascade laser based spectrometer for high-resolution spectroscopy of gas phase C60
… cascade laser (QCL) based continuous-wave cavity ringdown spectrometer (cw-CRDS) coupled to an oven supersonic expansion source. This is the first such work that uses a QCL in conjunction with the cw-CRD technique and a supersonic expansion source. The primary goal of the research is to …
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… inside a high-finesse near-concentric optical cavity. The broadband optical plasma emission was successfully sustained within the cavity and the light leaking from the cavity was used to measure broadband absorption spectra of gaseous azulene through (i) time-dependent cavity ring-down (CRDS), …