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 17 of 17 for “"Infrared absorption spectra"”.
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Intrinsic Spectroscopic Tumor Markers Revealed by Double-Differential Analysis of Near-Infrared Absorption Spectra
"Near infrared (NIR) optical methods provide contrast based on quantitative functional changes in tissue. NIR techniques have shown to be sensitive to changes in breast physiology from disease by quantifying total hemoglobin (oxyhemoglobin and deoxyhemoglobin), oxygen saturation, fat content, and …
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Steroid 2,4-Dinitrophenylhydrazones: their preparation, separation, and characterization
… defined groups on the basis of their ultraviolet spectra and that this classification could be correlated with the structures of the DNPH's. Within each group the compounds were similar to each other with respect to their melting points, color, solubilities and infrared spectra as well as their …
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Virpesinės spektrometrijos ir matricinės izoliacijos metodo taikymas molekulių su Silicio pakaitais struktūros tyrimams /
… scattering spectrum was recorded. Secondly, the infrared absorption spectrum at room temperature - 294.15 K was recorded. Due to the overly broad spectral bands and the significant influence of the environment, it is impossible to evaluate conformational distribution from these data. In order to …
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Interband and intraband optical studies of CdSe colloidal nanocrystal films
… by monitoring changes in the visible and infrared absorption spectra. Interestingly, the response is observed only in the nanocrystals that have been chemically treated with sodium biphenyl. Bleaching of the visible interband transition is observed upon electron injection into the …
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Matsubara Dynamics and its Practical Implementation
… the planetary model, we were able to calculate infrared absorption spectra for a point charge model of condensed-phase water over a range of thermodynamic conditions. We find that this harmonic approximation to Matsubara dynamics provides a good description of bending and vibrational motions and …
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Phonon scattering from substitutional impurities and lattice defects in silver chloride
… thermal conductivity technique. In addition, far infrared absorption measurements were made on some of the doped crystals. The thermal conductivity of silver chloride as a function of the concentrations of eight impurities-- Li+, Na+, K+, Rb+, uC +, Cu + + , Br - and I---was measured in the …
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Vibrational Kerr spectroscopy
The infrared vibrational Kerr effect was investigated as a potentially selective and sensitive detection method for explosives. The investigation of the vibrational Kerr effect commenced with the first reported measurement of the integrated infrared vapor absorption strengths for the explosives …
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Structure and Application of Photosensitive Self-assembled Pseudoisocyanine J-aggregates on Membrane Surfaces
… and selected area electron diffraction. The infrared absorption spectra of different polymorphs also displayed distinct differences. These separate examinations enabled a perspective that clarifies the geometry, packing, orientation, and size of templated J-aggregates. Insights into the …
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Relationships between crystal structure, bonding and thermal stability of amphiboles
… important in controlling the thermal stability. Infrared absorption spectra of amphiboles show the fine structure of the hydroxyl group. The frequency of the absorption band is related directly to the strength of the OH bond. Positive correlations exist between thermal stability and OH-stretching …
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Catalytic implications of confined solvent ensembles within Lewis acid zeolites
… the vibrational Stark effect. By measuring infrared absorption spectra of Ti-bound acetone in Beta zeolites of varying framework hydrophobicity across a wide range of non-coordinating solvents, we find unique electric field differences arising from distinct solvation under nanoconfinement. …
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Trends and inferred emissions of atmospheric high molecular weight perfluorocarbons
… CFE16 and 0.09 ppt for CF 18 . Newly measured infrared absorption spectra are presented for C7F 16 and CF 1 8 , and using these, their radiative efficiencies and global warming potentials (GWPs) are estimated. We find that the radiative efficiency of C8 F 18 at 0.57Wm- 2 ppb-' is similar to …
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Spectroscopy and Photochemistry of Europium atoms in low temperature solids - an experimental and theoretical study
… spectroscopy of the fblock metal atom elements. Absorption spectroscopy identifies the visible s - p type y 8P - a 8S and the UV f - d type 8P - a 8S electronic transitions of atomic Eu. The absorption spectra are complicated showing numerous features due to multiple guest site occupancy in the …
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The synthesis of some new aromatic polycyclic hydrocarbons
… of annelation. When the ultraviolet and visible spectra peak frequencies were compared it was found that the values and positions of the peaks follow the principles of the annelation method. The examination of the infrared absorption spectra revealed that naphtho[l,2-a]perylene, …
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The Electronic and Vibrational Spectroscopy of Matrix-Isolated Phthalocyanines – Experiment and Theory
… in which to study these molecules. The resulting spectral bands in inert cryogenic matrices are narrow and well resolved with relatively small shifts from the gas phase values. The aims of the work presented in this thesis are to record the vibrational and luminescence spectroscopy for free-base …
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The Electronic and Vibrational Spectroscopy of Metal Phthalocyanines and Metal Phthalocyanine Chlorides Isolated in Low Temperature Solids
… allows for the acquisition of highly resolved spectra with very narrow bandwidths and the absence of hot bands or rotational bands. Furthermore, the positions of the bands are only slightly shifted from gas phase values due to the weak interaction between the host and the guest species. The aim …