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 20 of 200 for “"Raman spectra"”.
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Length dependence of the Raman spectra of carbon nanotubes
… a few studies of length-dependent effects exist. Raman spectroscopy is a powerful tool for the characterization of carbon nanotubes. Although Raman spectroscopy nominally probes the phonon scattering processes in carbon nanotubes, the technique provides information on a wide variety of phenomena …
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Methods for Improving Signal to Noise Ratio in Raman Spectra
Raman microspectroscopy is an optoelectronic technique based on the inelastic scattering of light. This technique has been demonstrated to have potential to identify different materials based on subtle differences in the Raman spectral profile using various multivariate statistical classification …
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Double resonance Raman spectra of graphene : a full 2D calculation
Visible range Raman spectra of graphene are generated based on the double resonant process employing a full two-dimensional numerical calculation applying second-order perturbation theory. Tight binding expressions for both the TO phonon dispersion and the [pi] - [pi]* electronic bands are used, …
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Interpretation of Infrared and Raman Spectra Using Driven Molecular Dynamics Method
… computational work, vibrational infrared and Raman spectra of small size gas-phase molecules and complexes are studied using molecular dynamics (MD) method. Additionally, polarizability driven molecular dynamics method is employed to assign prominent vibrational modes beyond the constraint of …
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The Raman spectra and structure of silica and the soda-silica glasses
Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Chemistry, 1955.
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Techniques For Sensor-Integrated Robotic Systems: Raman Spectra Analysis, Image Guidance, And Kinematic Calibration
… classify data from a specific kind of sensor (a Raman spectrometer). The system is open and extensible, and it contains novel techniques for processing and analyzing the sensor data. Second, an image guidance system was made for use with a sensor-integrated robotic system (a Raman probe attached …
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Interpreting Raman spectra using machine learning: towards a non-invasive method of characterizing single cells
Raman microscopy has the potential to non-destructively measure the biomolecular changes in single cells in a label-free manner. However, the extent to which Raman spectra can effectively infer biologically-relevant information is not well understood. In this thesis, we use machine learning methods …
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Monitoring Bacteria Cultures Using Near Infrared (nir) Binary Spectronephelometry (bsn), Raman Spectra and Principal Component Analysis (pca)
… measurements, comprising fluorescence and Raman emission, with a grid of varying known concentrations of bacteria and media. For the normal lifecycle culture and for some but not all growth media, the results confirmed the linear dependence of the two measured signals on the concentration …
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Determination of the Raman Spectra of Molten ZnCl2 and Thermophysical Properties of Polymerized C60 Solids Using Atomistic Computational Techniques
… used to interpret the experimentally determined Raman spectrum of molten ZnCl_2, thereby providing never before available insights on the short range structural ordering in ZnCl_2, melts. In particular, using ab initio molecular dynamics (AIMD) the different structural motifs present in molten …
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A study of the Raman effect of cellulose: building of the spectrograph
… and oonstruoted with which it is believed Raman spectra may be obtained. 2. Attempts have been made using the spectrograph to obtain Raman spectra. These attempts, are as yet unsuccessful.
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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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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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Surface enhanced Raman spectrometry of C₆₀ in an electron tunneling gap
… using electromigration on a silicon substrate. Raman spectra were obtained for various features of this device in order to detect the presence of C6o and study its electronic properties. The 532 nm laser source showed Raman peaks at 300,522,930-980, 1570, 1900 and 2150 cm-¹ and the 632 nm laser …
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Raman Chemometrics and Application to Enzyme Kinetics and Urinalysis
Raman spectroscopy records the inelastic scattering of photons originating from striking a sample with monochromatic light. Inelastic, or Raman, scattered photons shift in wavelength due to excitation of the vibrational modes of molecules struck by the incident light. The Raman scattered photons …
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High pressure surface enhanced Raman scattering spectroscopy
Surface-enhanced Raman scattering spectroscopy (SERS) was combined with the diamond anvil cell technique to study molecular monolayers and single molecules under high pressure. Vibrational spectra up to 8 GPa were obtained for self-assembled monolayers (SAMs) of the energetic material simulant …
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Statistical Methods for In-session Hemodialysis Monitoring
… we aim at detecting difference between groups of Raman spectra generated from dialyzates at different time in one session. Baseline correction being a critical procedure in use of Raman Spectra, existing methods may not perform well on dialysis spectra due to nature of dialyzates, which contain …
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Experimental and Theoretical Study of Resonance Raman Spectroscopy in Ground and Excited Electronic States
… and selective control of molecular processes. Raman scattering is particularly useful in observing the vibrational properties of molecules, and identifying compounds based on structure. While the experimental measurements provide structural information on the vibrational transitions, the …
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Effects of energetic irradiation on materials and devices based on graphene and topological insulators
… disorder on the electronic properties and Raman spectra of graphene. These initial investigations were important for relating Raman peak intensities and weak localization features to each other and to an average disorder length in graphene, <em>L<sub>D</sub></em>. ^ We then integrate …
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