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 12 of 12 for “"low-frequency Raman"”.
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Light-matter interactions of two-dimensional materials and the coupled nanostructures
… and trion properties. Moreover, combining Raman spectroscopy and X-ray photoelectron spectroscopy, the effects of substrates and defects for MoS₂ have been revealed. Next, interlayer vibrational properties of 2D materials are studied utilizing low-frequency Raman spectroscopy. Twisted …
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CHARACTERIZATION OF CRYSTALLINE PIGMENTS WITH LOW-FREQUENCY VIBRATIONAL SPECTROSCOPY AND SOLID-STATE DENSITY FUNCTIONAL THEORY
… terahertz time-domain spectroscopy (THz-TDS) and low-frequency Raman spectroscopy (LFRS). In this work, the capabilities of THz-TDS and LFRS for identification and characterization of historic and modern pigments were evaluated. These experimental studies were supported with solid-state density …
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LASER-RAMAN ΦΑΣΜΑΤΑ ΟΥΣΙΩΝ ΕΝ ΠΡΟΣΡΟΦΗΣΕΙ
… SUBJECT OF THIS THESIS IS THE STUDY OF THE LASER-RAMAN SPECTRA OF CERTAIN SUBSTANCES IN THE STATE OF ADSORPTION ON THE FOLLOWING SUBSTRATES: SIO2, AL2O3, SIO2, AL2O3 ON SIO2 AND BENTONITE. THE SUBSTANCES USED WERE NAPHTHALENE, TRIPHENYLMETHANE, (AND SOME OF ITS DERIVATIVES), TRIPHENYLAMINE, …
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Exploring excitations and vibrations in semiconductor nanocrystals through fluorescence and Raman spectroscopy
… as a function of emission wavelength, and low-frequency Raman spectroscopy to measure acoustic phonons in nanocrystal solids. These two chapters serve as an introduction to the ideas and methods used throughout the thesis. In Chapter 3, Förster theory is used in conduction with spectrally- …
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Computational Methodologies for the Simulation and Analysis of Low-frequency Vibrations in Molecular Crystals
… of the simulations to experimentally measured low-frequency (sub-200 cm-1) vibrational spectra. As this region is dominated by weak intermolecular forces and shallow potential energy surfaces, even slight miscalculations in the solid-state packing arrangements can become readily apparent. In …
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Raman Spectroscopy Of Glasseswith High And Broad Raman Gain In The Boson Peak Region
This thesis investigates Raman spectra of novel glasses and their correlation with structure for Raman gain applications. Raman gain for all-optical amplification by fibers depends significantly on the cross section for spontaneous Raman scattering allowing to compare signal strength and spectral …
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Quantum noise propagation in nonlinear optical media
… from the general QMPM. Dispersion, linear loss, Raman scattering, forward Brillouin scattering (GAWBS), and two-photon absorption are incorporated into the model, which is linearized and solved for the continuous-wave case. The model successfully predicts several interactions between …
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Properties and device applications of silicon and silicon-germanium nanostructures with different dimensions
… Si NWs and 1D Si/Ge NW heterojunctions (HJs). Raman scattering and photoluminescence measurements show that by alternating heavily boron-doped layers with layers of undoped Si in Si/Si:B multilayers, dopant segregation and strain can be avoided. Current-voltage and capacitance-voltage …
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Low frequency light scattering in fused silica and rubidium silver iodide
We have measured the low frequency Raman spectra and the Rayleigh-Brillouin spectra of an amorphous solid,silicon dioxide, and a crystalline electrolyte, rubidium silver iodide. In fused silica the Raman spectra from 2K to 600K are independent of frequency shift from 4 to 10 cm-I• The scattering is …
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Nanoscale Origins of Thermal Transport Phenomena for Hybrid Layered Perovskites
… foundation and experimental construction of a frequency domain thermoreflectance technique to effectively measure the cross-plane thermal conductivity of 2D LHPs. This technique is then utilized to perform the first measurement of the thermal conductivity of 2D LHPs. This experimental study …
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Terahertz Raman Spectroscopy of Organic Molecules in Plasmonic Nanogaps
… extension of the technique of surface-enhanced Raman spectroscopy (SERS) from the infrared to the terahertz (THz) region of the electromagnetic spectrum. SERS was first discovered in 1977, and has since become a widespread, powerful analytical tool for chemistry and has led to the development of …
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Crystallisation and chain conformation of long chain n-alkanes.
… a function of the crystal form. Changes in the frequency of the first order of the L.A.M. present in the Raman spectra were also observed. At higher temperatures, non all-trans conformers, inferred from different infrared bands present in the wagging mode region, were found to be essentially …