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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 17 of 17 for “"cavity ring-down spectroscopy"”.
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Pulsed cavity ring-down spectroscopy in combustion environments
Contains fulltext : 19193_pulscaris.pdf (Publisher’s version ) (Open Access)
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Continuous-wave cavity ring down spectroscopy sensor for Hall thruster erosion measurement
… its development in future applications requiring a long operational time (several thousands of hours). Sputter erosion of boron nitride (BN) acceleration channel wall is principal lifetime limitation for Hall thrusters. The sputtered particles can redeposit causing a critical contamination …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
… technique exploited radicals generated during the thermal decomposition of triacetone triperoxide (TATP), a peroxide explosive, for detection. These radicals were amplified via a peroxide radical chemical amplification scheme (PERCA) that required the addition of NO and a radical chain …
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Instrument development for exploring the influence of interfacial chemistry on aerosol growth, aging, and partitioning of gases
… a novel rotating aerosol suspension chamber with cavity ring-down spectroscopy provided key insight into the effect of pollutants and other vapors on the overall atmospheric lifetime of particulate matter. The Atmospheric Cloud Simulation Instrument (ACSI) creates a well-defined and controllable …
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Spectroscopic investigations of the X and A state dynamics of ¹³C₂H₂
… Fluorescence (LIF), Dispersed Fluorescence (DF), Cavity Ring-Down Spectroscopy (CRDS), Noise Immune Cavity Enhanced Optical Heterodyne Molecular Spectroscopy (NICE-OHMS) and Stimulated Emission Pumping (SEP) are employed to study the spectroscopy and dynamics of acetylene. All of these experiments …
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Methane Dynamics in St. Louis Bay, Mississippi
… methane analysis was developed utilizing cavity ring-down spectroscopy and headspace equilibration. Samples of 70 mL were collected in 140 mL plastic syringes and equilibrated with a methane free headspace. Reproducibility was high (i.e. 4% typical RSD), and samples were successfully …
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Geographic Classification of Wines Using Their Elemental and Water Isotopic Composition; Special Emphasis on Washington State, USA
… Coupled Plasma Mass Spectrometry (ICP-QQQ) and Cavity Ring-Down Spectroscopy, respectively. Linear discriminant analysis resulted in successful regional and continental classification, with 97.5% and 99.2% correct assignments, respectively. WA and California wines were significantly different …
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Laserspektroskopische Bestimmung absoluter Konzentrationen von CN- und NH 2 -Radikalen in NO-dotierten Niederdruck-Wasserstoffflammen während der Verbrennung von Graphit
… Die CN-Konzentrationen wurden mit Hilfe der cavity ring-down spectroscopy (CRDS) und die NH2-Konzentrationen mittels der intracavity laser absorption spectroscopy (ICLAS) gemessen. Die Temperaturen wurden über laserinduzierte Fluoreszenz (LIF)Anregungsspektren von OH-Radikalen ermittelt. Die …
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Elucidating the chemistry of particulate and chlorinated nitrates in the troposphere through method development, and chamber and field studies
… chemical ionization mass spectrometry (CIMS) during the ORCA campaign in July 2015 on the west coast of Vancouver Island. Mean ClNO2 mixing ratios were small (< 10 pptv) with a maximum of 46 pptv, in part due to low precursor concentrations, i.e., of nitrogen dioxide (NO2) and ozone, and large …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… for the first time. Firstly, supercontinuum cavity enhanced absorption spectroscopy (SC-CEAS) was used for the kinetic measurement of chemical species in the liquid phase using a linear optical cavity. This technique is simple to implement, robust and achieves a sensitivity of 9.1 × 10−7 cm−1 …
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Addressing Water Resource Issues In Barbados Through An Isotopic and Atmospheric Characterization of Precipitation Variability
… The samples were analyzed using the Picarro Cavity Ring Down Spectroscopy Unit-Water L1102-I through laboratories at the University of Kentucky and the University of Utah. The samples were reported in per mil and calibrated. The teleconnection (NAO, AMO, and ENSO) and other atmospheric data …
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Novel diode laser absorption techniques for combustion diagnostics
… one of the most attractive options for measuring species concentration and spatial distribution profiles in reacting environments, such as flames. The generally non-intrusive nature and spatial resolution of these techniques are now preferred over on extractive sampling, followed by analysis …
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Development of a method for estimating methane gas emissions at high resolution
… estimates produced using bottom-up and top-down techniques. In response to this, an inversion approach, InTEM, was adapted to estimate methane emissions for the East of England at high spatial resolution. InTEM incorporates in situ atmospheric methane measurements and computer dispersion …
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Identification and Quantification of Greenhouse Gas Emissions from Oil and Natural Gas Operations Using an Aircraft-Based Mass Balance Technique
… in horizontal drilling and hydraulic fracturing techniques have led to a booming natural gas industry. Natural gas is considered a cleaner fuel alternative to coal, producing less carbon dioxide (CO2) upon combustion per unit energy produced, and therefore has been hailed as a bridge fuel …
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Plasma Dynamics in a High-Power Helicon Source
… such as Tuneable Diode Laser Absorption Spectroscopy (TDLAS) to determine atomic temperatures, Cavity Ring-Down Spectroscopy (CRDS) for direct negative ion density measurements, and an absolute intensity calibrated Optical Emission Spectroscopy (OES) method in conjunction with the YACORA …
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Plasma Dynamics in a High-Power Helicon Source
… such as Tuneable Diode Laser Absorption Spectroscopy (TDLAS) to determine atomic temperatures, Cavity Ring-Down Spectroscopy (CRDS) for direct negative ion density measurements, and an absolute intensity calibrated Optical Emission Spectroscopy (OES) method in conjunction with the YACORA …
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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 …