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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 18 of 18 for “"mid infrared spectroscopy"”.
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Progress in sensitive mid-infrared spectroscopy of cooled molecular ions
… cavity-enhanced optical heterodyne molecular spectroscopy (cm-NICE-OHMS) on a continuous gas-flow pinhole supersonic expansion discharge source for the study of cooled molecular ions. The instrument, which began as a difference-frequency generation (DFG) based system, is upgraded to include a …
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Optimization Techniques for Soil Organic Carbon Prediction Using Mid-Infrared Spectroscopy
… spatiotemporal data. In the last thirty years, mid-infrared (MIR) soil spectroscopy has developed as an accurate, rapid, cost-effective, and non-destructive technique for soil organic carbon (SOC) analysis. In soil spectroscopy, a calibration model relates spectral data to a corresponding …
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Characterizing Organic Coatings on Renaissance Bronzes with Short-Wave Infrared and Mid-Infrared Spectroscopy
… external reflection Fourier transform infrared spectroscopy (ER-FTIR) and fibre optic reflectance spectroscopy (FORS)—across the visible/near-infrared (VIS-NIR, ~400–1000 nm), short-wave infrared (SWIR, ~1000–2500 nm), and mid-infrared (MIR, ~2.5–25 μm) ranges. Twenty-six reference …
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Chemical physics and astrochemistry of H3+ and sub Doppler mid infrared spectroscopy of molecular ions
… such insight can only be derived if laboratory spectroscopy of these ions has been performed. However, for many ionic species, insufficient laboratory data are available, and this is primarily because of difficulties in producing sufficient quantities of ions for traditional spectroscopic …
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Developing near- and mid-infrared spectroscopy analysis methods for rapid assessment of soil quality in Illinois
Interest in use of near- (NIR) and mid-infrared (MIR) spectroscopic methods for soil quality assessment has grown rapidly. Ideally robust calibration of models can be developed to rapidly and affordably predict soil quality (SQ) indicators that are more costly to measure. Refinement of data …
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Relaxation Dynamics of Photoexcited Carriers in Graphene
… properties need to be explored. The proposed mid-infrared spectroscopy experiments in this thesis place an emphasis on understanding the physical phenomena in graphene. Graphene on its own has many peculiar layer-dependent properties which make it an interesting material to study. The first …
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Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets
… in the 8 - 13 [mu]m range, detectable by mid-infrared spectroscopy using transit. Therefore transit spectroscopy is an independent method to confirm the rocky nature of an exoplanet.
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
… of TEMPO at approximately 130 °C. In situ mid-infrared spectroscopy was successfully utilized to follow initiation, monomer conversion, and polymer formation. Real-time data allowed for the determination of apparent rate constants of 2.1E-5 s⁻¹ at 132 °C and 1.2E-5 s⁻¹ at 126 °C from the …
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Investigating the characterisation and stability of polyamide 6,6 in heritage artefacts
Near?infrared reflectance spectroscopy (NIR) is investigated as a method of non?invasive, in situ analysis of contemporary textile material. Besides providing spectral signatures, the advantages of NIR include the non?contact nature of the reflectance technique and the use of a remote, flexible …
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DEVELOPMENTAL CONSEQUENCES OF GESTATIONAL CANNABIS EXPOSURE IN RAT ACROSS THE LIFESPAN
… X-ray Fluorescence (XFI) and Fourier Transform Mid-Infrared spectroscopy to investigate biochemical changes in offspring brains. THC exposure led to decreased Cu in the corpus callosum, and altered lipid and protein content in the hippocampus, and lateral ventricle, pointing to neurochemical …
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Development of Multi-modal Optical Coherence Tomography Imaging Systems and Probes
… We combine the chemical specificity of mid-infrared spectroscopy with the morphological capabilities of OCT systems, potentially opening a new class of biomedical applications. First, we develop a swept-source OCT (SS-OCT) system that serves as a benchtop tool and a scalable platform for …
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Membrane investigations using infra-red spectroscopy and multivariate target factor analysis
Mid Infrared spectroscopy coupled with multivariate Target Factor Analysis (TFA) was used to investigate permeation and localisation of drugs through and within synthetic membranes and human skin. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy was used for the …
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Fate and Bioavailability of Per- and Poly-Fluorinated Substances (PFASs) in Soils
… soils; and diffuse reflectance Fourier transform mid-infrared spectroscopy coupled to partial least squares regression (DRIFT-PLSR). The sorption coefficients for all three compounds were at the lower end of the ranges previously reported, perhaps due to the low amounts of organic carbon (OC) and …
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Studies of the formation of homogeneous mixed silicon-titanium/zirconium oxides by the sol-gel route
… methods including X-ray diffraction, mid- and near-infrared spectroscopy and gas adsorption techniques. For SiO2-TiO2 powders and monoliths, and SiO2-ZrO3 monoliths, thermal treatment has been found to significantly reduce the surface area (from 750-1.0m2g-1), pore volume (from …
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Spectral Study of Asteroids and Laboratory Simulation of Asteroid Organics
… the spectra of asteroids at near- and mid-infrared wavelengths. In 2010 and 2011 we reported the detection of 3 ?m and 3.2-3.6 ?m signatures on (24) Themis and (65) Cybele indicative of water-ice and complex organics [1] [2] [3]. We further probed other primitive asteroids in the Cybele …
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Milk protein adulteration detection via mass spectra and infrared spectroscopy
… chromatography tandem mass spectrometry, and infrared spectroscopy to detect foreign protein spiked in milk, especially hydrolyzed plant proteins. Here are the major results: (1) According to the protein spots highlighted on the polyacrylamide gel of adulterated milk, β-conglycinin and …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
… Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) is one of the most sensitive spectroscopic techniques specific to molecular ions. NICE-OHVMS relies on the combination of three separate techniques, each of which is a powerful tool. Cavity enhancement extends the …
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Mid-Infrared Integrated Devices for Optical Chemical Sensing
The mid-infrared (MIR) spectral range is of special interest for establishing optical chemical sensor technologies by allowing specific molecular identification and quantification, whether the sample is in a liquid, gas or solid form, in addition to providing highly sensitive, rapid, reagent-free …