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Development of an electron time of flight spectrometer for ultrafast pulse characterization and ultrafast dynamics studiesTimilsina, Pratap January 1900 (has links)
Master of Science / Department of Physics / Carlos Trallero / This report presents the details of an electron time-of-flight (ETOF) spectrometer to be
used for characterizing ultrafast electric field pulses. The pulses will range in pulse-duration from
femtosecond to attoseconds and in wavelength from the far infrared (FIR) to the extreme ultra
violet (XUV). By measuring the photoelectrons in the presence of two electric fields and their
quantum interference we will be able to extract the amplitude and phase of the electric field. For
XUV pulses this is the well-known streaking and Reconstruction of Attosecond Beating by
Interference of Two-Photon Transition (RABITT) method.
The ETOF is based on a set of tunable electrostatic lenses capable of detecting 0-150 eV
electrons. In addition, we can selectively increase the photoelectron yield of the spectrum. The
precise tuning of the electrostatic lens system is done with a Genetic Algorithm (GA) with an
intensity fluctuation discriminator in the fitness.
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Development of novel oxidation catalysts for carbon isotope ratio analysisFomes, Charles William January 2000 (has links)
No description available.
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Design of a bore sight camera for the lineate image near ultraviolet spectrometer (LINUS)Cabezas, Rodrigo. 06 1900 (has links)
Approved for public release; distribution is unlimited. / The Lineate Image Near Ultraviolet Spectrometer (LINUS) is a spectral imager that works in the ultraviolet region of the spectrum. This thesis describes the latest of several steps in the development of this instrument. Due to the narrow field of view of the instrument, 2.5 x 0.5 degrees, an accurate pointing method is necessary; also, a scheme of quality evaluation of the post-processed spectral image is desirable. A way to achieve both goals was developed by designing and implementing the layout for two visual cameras, wide and narrow field of view, and a method to capture the images in order to perform the subsequent comparison with the processed spectral image. Since this is the first time the system is working in full-automated mode, a new wavelength calibration with the emission lines from a platinum hollow cathode lamp was performed and a new response curve for sulfur dioxide (SO2) was taken. Finally, laboratory and outdoor field observations were conducted to test the system integration. / Lieutenant, Chilean Navy
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Spectral response function characterization methodologies for imaging spectrometersCzapla-Myers, Jeffrey S. January 2000 (has links)
Thesis (M. Sc.)--York University, 2000. Graduate Programme in Earth and Space Science. / Typescript. Includes bibliographical references (leaves 107-111). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pMQ56168.
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Characterisation of coal slurries for introduction into ICP OES for multi-element determinationsMujuru, M, McCrindle, RI, Panichev, N 19 February 2009 (has links)
Abstract
The characterisation and stability of coal slurries for introduction into an inductively coupled plasma
optical emission spectrometer (ICP OES) and the application of slurries in the analysis of coal was
investigated. The importance of rheology and the stability of the coal slurries on the analytical results
produced by ICP OES was demonstrated. The homogeneity and stability of various coal slurries were
characterised by sedimentation tests, scanning electron microscopy (SEM), zeta potential and viscosity
measurements. The porosities and surface areas of different South African coals and a mechanism for
the adsorption of the dispersants onto the coals were determined using low-temperature nitrogen
physisorption studies. The possibility of partially solubulising the coal in N,N-dimethylformamide
(DMF) was investigated. SEM indicated that DMF solubulised coal fines and that 0.1% (m/v) Triton
X-100 with 10% (v/v) DMFresulted in well dispersed slurries relative to other dispersants (glycerol, PEI
and water). Slurry analysis of coarse and ground coal in 0.1% (m/v) Triton X-100, showed that higher
emission intensities and better precision was obtained when using ground coal. This was confirmed by
lower RSDs (less than 5% for most of the elements analysed) relative to the unground, coarse coal.
Glycerol slurries gave higher RSDs (higher than 5% for most of the elements) most of the time, thus
negatively influencing the precision of measurement. Physisorption studies indicated that ground coal
had up to ten times higher surface areas than coarse coal. The higher surface areas for fine ground coals
suggested why they were better dispersed and thus better transported into the plasma, resulting in
higher emission signals. Zeta potentials indicated that for all dispersants, the coal particles were well
repelled from each other, although SEM pictures indicated better dispersion for 0.1% (m/v) Triton
X-100 with 10% (v/v) DMF. It was demonstrated that higher intensities and higher precision could be
obtained with well dispersed and stable coal slurries.
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An electron spectrometer using adiabatic motion in a magnetic field /Rouleau, Gary. January 1986 (has links)
No description available.
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Optimization studies of high performance liquid chromatograph/inductively coupled plasma atomic emission spectrometer interfaceWhaley, Brenda Elaine Spears 12 1900 (has links)
No description available.
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Optical studies of thermoluminescent materials / by Phillip James FoxFox, Phillip James January 1990 (has links)
Bibliography: leaves 120-127 / iv, 127, [158] leaves : ill., map ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1990
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Two facets of the x-ray microanalysis at low voltage the secondary fluorescence x-rays emission and the microcalorimeter energy-dispersive spectrometer /Demers, Hendrix. January 1900 (has links)
Thesis (Ph.D.). / Written for the Dept. of Mining and Materials Engineering. Title from title page of PDF (viewed 2008/01/12). Includes bibliographical references.
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Ultra-compact holographic spectrometers for diffuse source spectroscopyHsieh, Chaoray. January 2008 (has links)
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008. / Committee Chair: Adibi, Ali; Committee Member: Chang, Gee-Kung; Committee Member: Ralph, Stephen; Committee Member: Trebino, Rick; Committee Member: Verriest, Erik I.
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