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Showing 1 to 20 of 23 for “"Ultraviolet spectroscopy"”.
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Transient extreme ultraviolet spectroscopy of semiconductors
Transient extreme ultraviolet (XUV) spectroscopy is used to investigate ultrafast photophysics in lead iodide (PbI2) and methylammonium lead iodide perovskite (MAPbI3). Sub-30 fs pulses of XUV light are produced to use as a probe in a tabletop instrument using high-harmonic generation. PbI2 and …
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Extreme Ultraviolet Spectroscopy of the Solar Corona
New Extreme Ultra-Violet (EUV) observations of the solar corona, obtained by the Coronal Diagnostic Spectrometer (CDS) instrument on board the NASA/ESA Solar and Heliospheric Observatory (SOHO) are presented. The CDS instrument for the first time has provided the opportunity of observing a large …
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The far-ultraviolet spectroscopy of molecules of astrophysical interest
… are seen near hot OB-type stars whose far-ultraviolet emission is intense. Laboratory spectroscopy of such molecules will lead to a better understanding of their astrophysical behaviour, in particular Celestial Masers. This thesis is preoccupied with the spectroscopy of H$_{2}$O, D$_{2}$O, …
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Improving vacuum ultraviolet spectroscopy using instrumental modifications and chemometric applications.
… of 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 …
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Ultrafast photophysics of organohalide perovskites by transient extreme ultraviolet spectroscopy
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Ultrafast extreme ultraviolet spectroscopy of transition metal dithiolate coordination complexes
… x-ray absorption near edge structure (XANES) spectroscopy using extreme ultraviolet (XUV) light is used as a tool to interrogate the evolution of the metal center in a series of transition metal dithiolate complexes. The behavior of these molecules after absorption of light has implications …
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Development of solution-phase extreme ultraviolet spectroscopy and photophysics of μ-oxo-bridged Fe(III)porphyrins
… the field of transient M-edge x-ray absorption spectroscopy to study molecular complexes in the solution-phase. A gas-accelerated liquid sheet method is adapted to operate in the vacuum conditions needed for XUV transmission. Gas-generated liquid sheet of chlorinated solvents transmissible to …
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Development & characterization of bio-inspired earth-abundant metal systems and extreme ultraviolet spectroscopy of precious metal photocatalysts
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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The kinetics of successive aquation reactions of tetraamminepalladium (II) ion
… of tetraamminepalladium (II) ion were studied by ultraviolet spectroscopy. First order rate constants were evaluated for each step of the reaction series at various temperatures. Activation parameters were determined. (Equations) Mechanisms for the consecutive reactions are proposed, and cis and …
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The Detection and Identification of Explosives by Canines and Chemical Instrumentation
… Post-Blast Debris via Gas Chromatography/Vacuum 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 …
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Star-like macromers from lignin
… osmometry, hydriotic acid/gas chromatography, ultraviolet spectroscopy, proton-nuclear magnetic resonance spectroscopy and thermal analysis. Number average molecular weights were measured by vapor pressure osmometry. Total hydroxyl content was determined after acetylation by potentiometric …
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DERIVATIVES OF 2-BENZYLIDENECYCLOHEXANONE AS POTENTIAL ANTINEOPLASTIC AGENTS
… in vitro, and a low level of toxicity in mice. Ultraviolet irradiation resulted in isomerization of the substituted (E)-2-benzylidenecyclohexanones to the Z isomers. (Z)-2- Benzylidenecyclohexanone was isolated from the ultraviolet irradiation of the E isomer. Ultraviolet spectroscopy and the …
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Synthesis and characterization of poly(2,2,2- trifluoroethoxyphosphazene)polystyrene graft copolymers
… components. Infrared and ultraviolet spectroscopy revealed the presence of polystyrene in the graft copolymer system; however, these results were difficult to verify due to the possibility of polystyrene homopolymer contamination. Calculation of the number of polystyrene …
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Aqueous poly(arylene ether ether ketone) suspensions
… acts as an electrostatic aqueous stabilizer. Ultraviolet spectroscopy was employed to measure and compare adsorption isotherms in both THF and toluene. This high performance electrostatic stabilizer has been used successfully to stabilize aqueous suspensions of both larger particles (~ 12 …
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Effect of Increased Carbon Dioxide Levels on Urushiol Production in Toxicodendron radicans and Toxicodendron toxicarium
… analyzed through thin layer chromatography and ultraviolet spectroscopy to determine the amount present in each plant after sixteen weeks of exposure in the two growth chambers. The overall urushiol production and the average weight of the leaves decreased as time elapsed in both chambers. …
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Novel mesoporous silicates as indoor air pollutant scavengers
… by high performance liquid chromatography ultraviolet spectroscopy. A pollutant atmosphere suitable for testing the sorbents chambers were created in-house. Mesoporous silicates were synthesised to control the surface area, pore size and pore volume of the material. Several preparation …
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The relation between atomic and molecular gas: the Magellanic Clouds and beyond
… I employ two different observational techniques, ultraviolet spectroscopy and radio interferometry imaging, to study the atomic and molecular gas relation in the Large/Small Magellanic Clouds and 43 nearby galaxies. These galaxies demonstrate various galactic environments compared with the Milky …
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A spectroscopic study of square planar platinum (2) complexes
… number of spectroscopic techniques consisting of ultraviolet, ¹H-NMR and mass spectrometry have been used in the structural analysis of square planar Pt(II) complexes. The complexes trans-[PtBr₂(Y) (R-an)] (Y = C₂H₄,CO; R-an = substituted aniline) were prepared and investigated by the spectrosopic …
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Studies of vacuum ultraviolet absorption spectra of simple gases
… in the first order of a 21-foot vacuum ultraviolet spectrograph. The background continuum was provided by a xenon discharge lamp excited by a 2450 Mc/sec microwave diathermy unit. The exposure time varied from 30 minutes to four hours depending upon the slit width. Wavelength standards …
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In Vitro Methanogenesis From Formaldehyde. Identification of Three Carbon-1 Intermediates of the Methanogenic Pathway
… by O(,2). ('1)H and ('13)C NMR spectrometry and ultraviolet spectroscopy was used to document the binding of C(,1) units of different oxidation states to FAF. Methanogenesis from each derivative of FAF (formyl, methylene, and methyl) was kinetically comparable to CH(,3)-S-CoM. All the derivatives …
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