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 46 for “"VUV"”.
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ANALYTICAL STUDIES IN VACUUM-ULTRAVIOLET (VUV) SPECTROPHOTOMETRY.
ANALYTICAL STUDIES IN VACUUM-ULTRAVIOLET (VUV) SPECTROPHOTOMETRY.
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Rare-gas clusters in intense VUV laser fields
… intense laser fields in the vacuum ultra-violet (VUV) has been developed. Much emphasis is put on localized electrons, those quasi-free electrons which localize about the ions and screen them. These electrons set a time scale, which is used to interpolate between the quantum, rate based …
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VUV 157nm F₂ laser irradiation of micro- and nano-scale particles
… with the 157nm wavelength vacuum ultraviolet, VUV, emission from a molecular fluorine gas, F₂, laser. The laser system is introduced and an overview of laser ablation of polymers is presented.Small particles of different materials and sizes, supported on polymeric substrates, are irradiated at …
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Gas phase vacuum-ultraviolet (vuv) spectroscopy of small halogenated polyatomic molecules
… in the gas phase with vacuum-ultraviolet (VUV) radiation. For all the experiments described in this thesis, the source of radiation was from tuneable VUV radiation from a synchrotron source. The majority of the experiments used the UK national source located at Daresbury Cheshire. …
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A krypton VUV photoionization source for gas chromatography and mass spectrometry.
The use of a coaxial krypton discharge lamp to selectively photoionize samples in a complex matrix is described. The lamp produces a krypton line emission spectrum with available photon energies of 10.0 and 10.6 eV. When used as a photoionization mass spectrometer source, conditions can be created …
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VUV laser-induced plasma spectroscopy for low level sulphur detection in steel
… emission lines from these elements lie in the VUV part of the spectrum. In this thesis, the VUV region of the spectrum has been exploited using a spatially-resolved approach which has proved to be superior to the more conventional time-resolved ultraviolet and visible LlPS experiments Spectral …
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Electronic structure of A12O3 : VUV reflectivity measurements from room temperature to 1100C̊
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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Experimental study of rare-gases excimer VUV system and H2 Lyman-bands calibration
An electron impact rare gas excimer vacuum ultra-violet experimental system is custom-designed and tested using an argon and H2 mixture. An electron flooding system, i.e. filament, is used as the hot electron source. A SiNx membrane is applied as the entrance foil separating the high vacuum chamber …
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Investigation of Host-Sensitized Luminescence of Trivalent Lanthanide Doped Yttrium Phosphate using VUV Spectroscopy
… via two synthetic approaches was studied using VUV spectroscopy. A correlation between an unusually intense 150 nm excitation intensity and the ground state energy level of select trivalent lanthanide elements was proposed. Using spectroscopy, the host-to-activator transfer efficiencies of …
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VUV emission from the heavy alkali metals and rare gas impurities in alkali metals
Core excitations in metals create a local change in potential that couples strongly to the sea of conduction electrons. The response of the electron liquid to this local shock is reflected in its excitation spectrum; this can be probed by various core-level spectroscopies. The research described in …
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Improving vacuum ultraviolet spectroscopy using instrumental modifications and chemometric applications.
… most analytes using GC-MS. Vacuum Ultraviolet (VUV) spectroscopy is a technique that, like MS, is useful for both qualitative and quantitative measurements of gas-phase molecules. Although VUV spectroscopy has been practiced since the late nineteenth century, it is only recently that a …
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Theoretical and experimental investigation into the IR-VUV ion dip spectroscopy of amino acids and analogue systems
… species. Here presented are the results of IR-VUV ion dip spectroscopy, coupled with a high-level theoretical examination of the spectroscopic results, including MP2 and CASSCF calculations. In IR-VUV ion dip spectroscopy, the isolated neutral molecules are ionized by a single photon of 10.5 eV …
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Erzeugung von kontinuierlicher kohärenter Lyman-alpha-Strahlung zur 1S-2P-Spektroskopie an Antiwasserstoff
… Erzeugung von kontinuierlicher, kohärenter VUV-Strahlung bei Lyman-alpha und die Spektroskopie an Wasserstoff mit dieser Strahlung beschrieben. Die experimentellen Beobachtungen zur VUV-Erzeugung können durch Modell-Rechnungen richtig wiedergegeben werden. Lyman-alpha-Strahlung liegt bei …
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The Detection and Identification of Explosives by Canines and Chemical Instrumentation
… Ultraviolet Spectroscopy (GC/VUV), utilizes gas chromatography/vacuum ultraviolet spectroscopy (GC/VUV) to determine the difference in chemical composition of two smokeless powders in both pre- and post-blast conditions. The compounds of interest in this study were …
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Spectroscopy and Photo-induced Chemistry of Atmospherically Significant Criegee Intermediates and Hydroxyl Radicals
… using fixed-frequency vacuum ultraviolet (VUV) radiation and detected in a time-of-flight mass spectrometer. Ultraviolet (UV) excitation of the Criegee intermediates on very strong pi*-pi transitions localized on the COO group induced significant depletion of the ion signals near the peak …
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The preparation of porous microcolumn arrays of silicon, and post-ionization of neutral particles from DIOS-MS
… source. In this thesis the high sensitivity of VUV laser SPI was combined with the excellent desorption capabilities of DIOS for the first time. This method is labeled SPI-DIOS-MS. First, a home-built apparatus combining electrochemical etching with laser irradiation was developed to produce …
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Luminescent Characteristics Study of a Mather-Type Dense Plasma Focus and Application to Laser Optical Pumping
… density. Due to its intense vacuum ultraviolet (VUV) emission, the MDPF is an ideal candidate for optically pumping very-short-wavelength lasers. The hard and soft X-ray emissions as well as the VUV output of the MDPF also make it a viable high-intensity source for high-throughput …
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Silicon microcavity and microchannel plasma devices: spectroscopy and time-resolved optical experiments
… ultraviolet (UV) and vacuum ultraviolet (VUV) radiation. The realization of this new platform for devices is implemented through VLSI and MEMS fabrication techniques. In this thesis, the basic physics of plasma discharges is presented, and the performance of Si microplasma devices with …
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The Development of a Novel Femtosecond Xuv Light Source to Do Spectroscopy of Atoms and Molecules.
… a promising way to generate usable short pulse VUV light. The purpose of this thesis work is to develop a tabletop, bright, coherent, short pulsewidth VUV light source for studying the spectroscopy of atoms and molecules. This pioneering work has a number of potential applications such as …
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