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Showing 1 to 17 of 17 for “"resonance Raman scattering"”.
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Resonance raman scattering studies of GaAs-A1As superlattices
"We have made resonance Raman scattering studies of folded LA phonons and quantized LO phonons in several GaAs-AlAs superlattices. The motivation for this work was to study the electronic structure and the electron-phonon interaction in these structures. The samples were not intentionally doped. …
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Resonance Raman Scattering Studies of Gallium-Arsenide - Aluminum-Arsenide Superlattices
We have made resonance Raman scattering studies of folded LA phonons and quantized LO phonons in several GaAs-AlAs superlattices. The motivation for this work was to study the electronic structure and the electron-phonon interaction in these structures. The samples were not intentionally doped. The …
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Precision studies of stimulated resonance Raman scattering in atomic beams
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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The synthesis of stable nanotags for the detection of biomolecules using surface enhanced Raman scattering
… using ultraviolet-visible (UV-vis) spectroscopy, Resonance Raman scattering (RRS) and surface enhanced resonance Raman scattering (SERRS). Nanozymes have been applied to various different applications, some of which are explored in this thesis. The overall aim of this research was to investigate …
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Nanoparticle sensors for the detection of DNA related to disease
… of DNA related to disease using surface enhanced resonance Raman scattering (SERRS) spectroscopy. In order to achieve this, both gold and silver nanoparticle conjugates were successfully functionalised with thiol- and thioctic acid-modified oligonucleotides. To investigate their viability as …
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Novel enzymatic methods of DNA detection using enhanced Raman scattering
… colorimetric DNA detection, and surface enhanced resonance Raman scattering (SERRS), which provides improved sensitivity in comparison to fluorescence along with the potential for multiplexed analysis. Additionally, the use of enzymes in DNA detection to provide a method of target cycling and …
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Effects of Substrate and Molecular Adsorption on Raman Scattering From Individual Single -Walled Carbon Nanotubes
… environment) or intentional and substrate on resonance Raman scattering measurements on isolated SWCNTs. By correlating Raman scattering measurements with electronic properties of nanotubes, we show that adsorption of O2 from ambient environment leads to charge transfer (and the Fermi level …
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Biopolymer-mediated analyte detection via photoluminescence modulation of single-walled carbon nanotubes
… optical properties—both photoluminescence and resonance Raman scattering—demonstrate their tunable nature. Solution dispersed SWNT are sorted by length and the photoluminescence quantum yield is shown to increase nonlinearly with length, suggesting that SWNT ends quench the exciton. The change …
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Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy
… reports the results of two studies which use resonance Raman scattering to evaluate the vibrational properties of single walled carbon nanotubes (SWNTs). In the first study, we report an evaluation of second-order combination and over-tone modes in highly ordered pyrolytic graphite (HOPG), in …
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Modified oligonucleotides for the functionalisation of nanoscale materials
… of hybridisation events by surface enhanced resonance Raman scattering (SERRS). Thioctic acid was considered a suitable linker group with which to tether oligonucleotides to nanoparticle substrates. As such, routes to the modification of oligonucleotides by thioctic acid are reported herein. …
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Aptamers as biosensors
… Other methods including surface plasmon resonance (SPR) and circular dichroism were attempted. The phenomenon of naturally occurring RNA molecules with catalytic properties (ribozymes) were the inspiration for the development of catalytic aptamers. Consequently, a novel SELEX system was …
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Nanoparticle probes for the study of biomolecular interactions
… utilised for detection by surface enhanced resonance Raman scattering (SERRS). This method of detection enables multiple DNA sequences to be detected simultaneously due to the molecularly specific and narrow emission spectral profiles obtained. As such, the multiplexing capabilities of this …
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Physicochemical properties of the anion-modified surfaces of silver nanostructures
… silver surface was monitored by surface-enhanced Raman spectroscopy. A characteristic halide-metal stretching vibration was observed at 112 cm-1 for I- and at 156 cm-1 for Br-. Extinction spectra of the halide-modified Ag colloids showed a frequency-shift and damping of the surface plasmon …
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Probing the Ultrafast Dynamics of Higher-Lying Excited States of Molecular Switches with Femtosecond Stimulated Raman Spectroscopy
… states of photochemical systems are measured by resonance transient Raman spectroscopy and provide information on the dynamics of the system following two-photon sequential excitation through mode-specific enhancements. Sequential excitation allows for optical control of the system by accessing …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… known as localized surface plasmons, at resonance frequencies that depend on the particle size and shape and the local dielectric environment. Nanoparticle absorption and scattering cross-sections are maximized at surface plasmon resonance frequencies, and the electromagnetic field is …
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Lineare und nichtlineare Raman-Spektroskopie an biologisch relevanten Modellystemen
… Hilfe von diversen linearen und nichtlinearen Raman-spektroskopischen Techniken bearbeitet. Neben der Untersuchung von Wasserstoffbrücken-gebundenen Komplexen und ihrer Dynamik auf der fs-Zeitskala (Kapitel 4) bildeten Untersuchungen zur Struktur von Porphyrinen (Kapitel 5) und beta-Carotin …