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Dissertations / Theses on the topic 'Resonant Raman Effect'

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Published: 6 September 2023

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1

Feng, Yejun. "Exciton spectroscopy using non-resonant x-ray Raman scattering /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/9642.

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2

Tanaka, Tomoyoshi. "Resonance raman and surface enhanced raman studies of hemeproteins and model compounds." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/27678.

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3

Short, Billy Joe. "Ultraviolet resonance Raman enhancements in the detection of explosives." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Jun/09Jun%5FShort.pdf.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2009.
Thesis Advisor(s): Smith, Craig F. "June 2009." Description based on title screen as viewed on 14 July 2009. Author(s) subject terms: Raman spectroscopy, standoff detection, high explosives, explosive detection, inelastic scattering, resonance Raman. Includes bibliographical references (p. 77-80). Also available in print.
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4

Rwere, Freeborn. "Resonance Raman studies of isotopically labeled heme proteins." [Milwaukee, Wis.] : e-Publications@Marquette, 2009. http://epublications.marquette.edu/dissertations_mu/22.

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5

Lin, Shun-hua. "Resonance raman studies of hemoproteins and model heme complexes." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/30311.

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6

BOURGEOIS, CHARIGOT MARIE-THERESE. "Diffusion raman resonnante et structure des etats moleculaires excites." Reims, 1988. http://www.theses.fr/1988REIMS013.

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Des modeles d'etude sont proposes et appliques a differentes especes moleculaires. Les modeles suivants, de complexite croissante, sont presentes: approximation de reflexion, approximation harmonique, potentiels de morse, modele analytique tridimensionnel incluant l'effet duschinsky. Ce dernier modele est applique au cas de l'ozone et etendu ensuite aux molecules rendues non symetriques par une substitution isotopique
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7

Foster, Catherine. "Resonance raman intensity analysis of chlorine dioxide in solution /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/11595.

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8

Kernohan, Edward Thomas Mark. "High resolution resonant Raman scattering in InP and GaAs." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364445.

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9

Rodriguez, Arturo A. (Arturo Angel). "Raman and NMR Relaxation Studies of Molecular Dynamics in Liquids." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc330818/.

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Raman vibrational bands are sensitive to fluctuations in the molecular environment. Variations in the bandwidth and peak position can then be utilized to monitor molecular forces and interactions present in condense phases. Nuclear Magnetic Resonance (NMR) provides a convenient probe for the study of molecular reorientation in liquids since nuclear spin relaxation times are dependent on the details of molecular motion. Presented here is the solvent study of the Raman bandwidths and frequency displacements of the mode of the compounds CH3MCI3 (M = C, Si, Ge, Sn) in a number of solvents of widely varying molecular structure. Also, a detailed isotope dilution study of the modes in CH2CI2/CD2CI2 mixtures is presented. In this set of experiments, I observed broadening of the v1 mode of CH2C12 upon dilution,which is the first experimental observation of such behavior. The temperature-dependent carbon-13 relaxation times and nuclear Overhauser enhancements in neat dichloromethane were measured. In this study we found that the molecular reorientation of this molecule was highly anisotropic, but could be well characterized assuming quasi-symmetric top behavior. In addition, in order to gain a more complete understanding of the reorientational dynamics in dichloromethane, we analyzed the 13-C NMR relaxation of CH2CI2 both in "inert" solvents of differing viscosities and in interactive solvents of varying Lewis basicities. Various theoretical models were also applied in order to characterize dichloromethane1s reorientational dynamics.
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10

Kabagambe, Benjamin. "Spectroscopic investigation of proteins : UV resonance Raman studies of apomyoglobin /." Saarbrücken, Germany : VDM Verlag Dr. Müller, 2008. http://etd.library.pitt.edu/ETD/available/etd-10232007-094038.

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Thesis (M.S.)--University of Pittsburgh, Department of Chemistry, 2007.
Thesis advisor: Sanford A. Asher. Also available as an electronic book in PDF on the University of Pittsburgh Library Web site. Bibliography: p. 37-41.
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11

Chan, Wing-sum. "Resonance Raman, time-resolved resonance Raman and density functional theory study of Benzoin diethyl phosphate, selected P-Hydroxy and P-methoxy substituted phenacyl ester phototrigger and model compounds." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36198821.

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12

Ong, Shing-yau, and 王承祐. "Time-resolved resonance raman investigation of selected arylnitrenes and their reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31227740.

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13

蔡子良 and Chi-leung Dickson Choi. "Vibrational reorganization energies of the LMCT transition of PdCI2(PPh3)2 and the MLCT transition of several Pt-acetylide complexesdetermined by resonance Raman intensity analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31215154.

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14

Yazdi, Youseph. "Application of fluorescence and UV resonance Raman spectroscopy to the diagnosis of neoplastic changes in cytological specimens /." Digital version accessible at:, 1997. http://wwwlib.umi.com/cr/utexas/main.

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15

Choi, Chi-leung Dickson. "Vibrational reorganization energies of the LMCT transition of PdCI2(PPh3)2 and the MLCT transition of several Pt-acetylide complexes determined by resonance Raman intensity analysis /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19945814.

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16

Chan, Wing-sum, and 陳穎心. "Resonance Raman, time-resolved resonance Raman and density functional theory study of Benzoin diethyl phosphate, selected P-Hydroxy and P-methoxy substituted phenacyl ester phototrigger and model compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36198821.

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17

Thibodeau, Daniele L. Carleton University Dissertation Chemistry. "Resonance raman excitation study of monomeric and dimeric chlorophyll a in solution." Ottawa, 1988.

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18

PICCO, ANDREA. "Resonance effects in the Raman analysis of sige nanostructures." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28617.

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In the last two decades, attention has raised towards SiGe nanostructures for applications in microelectronics and optoelectronics. Many efforts have been payed in order to control the growth of the nanostructures and characterize their structural properties: for this purpose, a wide series of different experimental techniques have been developed. Raman spectroscopy of SiGe is commonly used to obtain information about the average values of composition and strain inside the nanostructures. Actually, due to the lack of data about the Raman efficiency of SiGe as a function of the alloy composition and the excitation light frequency, it is not possible to extract information about the composition profiles which are known to be present inside the structures and deeply affect their optoelectronic properties. In this work, the Raman efficiency of SiGe is measured across the whole compositional range for six different excitation light energies in the UV and VIS range. Strong resonances in the Raman efficiency of SiGe are observed, related to the direct electronic transitions in the material: their origin is explained by means of the theory and confirmed by semiempirical calculations. Then, a numerical tool is presented, which is able to analyze the Raman spectrum of an inhomogeneous SiGe structure and extract information about its internal composition profile by taking into account the effects of the resonance on the SiGe Raman efficiency. The methodology is validated by means of a calibrated SiGe sample, and applied to the study of SiGe islands. The internal composition profile of the islands obtained with this methodology is in good agreement with the results of independent techniques. Finally, the powers and limitations of the methodology are investigated.
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19

Chu, Lai-man. "Time-resolved spectroscopic investigation of chloroaniline and oxetane related compounds." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39557455.

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20

朱麗敏 and Lai-man Chu. "Time-resolved spectroscopic investigation of chloroaniline and oxetanerelated compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39557455.

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21

Simpson, John Jiji Renee. "Development of advanced chemometric methods for the analysis of deep-UV resonance Raman spectra of proteins." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6873.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 24, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Renee Jiji. Includes bibliographical references.
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22

Chan, Pik-ying. "Time-resolved resonance Raman investigation of selected para-substituted phenylnitrenium ions and the 2-fluorenylnitrenium ion reaction with guanosine." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36189881.

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23

Large, Nicolas. "Resonant Raman-Brillouin scattering in semiconductor and metallic nanostructures : from nano-acoustics to acousto-plasmonics." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1413/.

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Ce travail est axé sur l'étude des propriétés optiques de nanostructures semiconductrices et métalliques par le biais des processus de diffusion inélastique de la lumière par les vibrations acoustiques (VA) basses fréquences [Raman-Brillouin (RB)]. Les nanostructures semiconductrices possèdent des états électroniques confinés qui sont impliqués dans ce processus de diffusion. Les nano-objets métalliques, lorsqu'ils sont soumis à un champ électrique externe, supportent quand à eux des modes d'oscillation collective des électrons de conduction (plasmons). Lors de la diffusion RB, ces plasmons sont des intermédiaires lors du processus d'absorption ou d'émission des VA. L'étude des interactions entre les VA et les excitations électroniques (excitons et plasmons) nous renseignent sur les propriétés optiques et vibrationnelles de ces nano-objets. De nouveaux concepts physiques sont introduits pour l'interprétation des processus de diffusion RB. Ainsi, une densité électronique effective, responsable de la diffusion RB dans les semiconducteurs, et une pression responsable du processus de diffusion dans les métaux sont introduites pour la première fois comme outils d'interprétation avancés des processus de diffusion inélastique de la lumière par les VA. Le concept d'acousto-plasmonique est également introduit pour la première fois afin de décrire la modulation des propriétés plasmoniques des nano-objets métalliques par les VA. Ces concepts et les méthodes numériques utilisées (BEM, DDA, FDTD) ont permis de décrire des effets physiques fins tels que d'importants décalages vers le rouge de résonances plasmons ou l'observation inattendue de certaines VA en spectroscopie RB
This work is devoted to the study of the optical properties of semiconductor and metallic nanostructures. The inelastic light scattering by low frequency acoustic vibrations (AV), called Raman-Brillouin (RB) scattering, gives access to such properties. The confined electronic states of semiconductor nanostructures are involved in the RB scattering as an intermediary. When applying an external electric field, metallic nano-objects sustain collective oscillation modes of the free electron gas (plasmons) which also act as an intermediary during the emission and the absorption of low frequency AV in the RB scattering process. The understanding of the interaction between the AV and the electronic excitations (excitons or plasmons) gives direct information on the optical and vibrational properties of those nano-objects. New physical concepts are introduced as theoretical tools for the interpretation of the RB scattering in semiconductors and metals. An effective electronic density, responsible for the RB scattering in semiconductors, is here introduced for the first time as new advanced theoretical tool for the interpretation of the inelastic light scattering processes by low frequency AV. The concept of acousto-plasmonics is also introduced for the first time to study and describe the modulation of the plasmonic properties of metallic nano-objects by the AV. These concepts and the numerical methods used in this work (BEM, DDA, FDTD) allowed to interpret fine physical effects such as significant spectral red-shifts of plasmons resonances and unexpected observations of AV by RB spectroscopy
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24

Chuang, Yung-ping, and 莊蓉萍. "Time-resolved resonance raman and density functional theory studies ofthe photochemistry of (S)-ketoprofen." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40988156.

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25

Cheng, Yung-fong Yvonne. "Resonance raman investigation of metal to ligand charge transfer transitions in selected inorganic complexes." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22713359.

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26

Chuang, Yung-ping. "Time-resolved resonance raman and density functional theory studies of the photochemistry of (S)-ketoprofen." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40988156.

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27

Chan, Pik-ying, and 陳碧瑩. "Time-resolved resonance Raman investigation of selected para-substituted phenylnitrenium ions and the 2-fluorenylnitrenium ionreaction with guanosine." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36189881.

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28

陳容芳 and Yung-fong Yvonne Cheng. "Resonance raman investigation of metal to ligand charge transfer transitions in selected inorganic complexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224143.

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29

Nyholm, Bethany Paige. "Resonance Raman intensity analysis of chlorine dioxide, nitrosyl chloride, and isopropyl nitrate in solution /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/8496.

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30

Williams, Derrick. "Effect of red blood cell velocity on oxygenation measurements using resonance raman spectroscopy /." VCU Scholars Compass, 2005. http://hdl.handle.net/10156/1445.

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31

Li, Yunliang, and 李運良. "Time-resolved resonance Raman and density functional theory investigations of selected isopolyhalomethanes, haloalkyl radicals andpolyhalomethane/halogen atom molecular complexes and their reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245717.

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32

Calderon, Filho Cesar José 1987. "Estudo teórico de sistemas de elétrons fortemente correlacionados." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276972.

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Orientadores: Gaston Eduardo Barberis, Eduardo Granado Monteiro da Silva
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-08-25T18:32:09Z (GMT). No. of bitstreams: 1 CalderonFilho_CesarJose_D.pdf: 5035446 bytes, checksum: fcbe04000b9cbb2451812618227a75ac (MD5) Previous issue date: 2014
Resumo: Este trabalho é dedicado ao estudo dos multiferróicos, um tipo especial de sistema de elétrons fortemente correlacionados. Foram analisadas teoricamente estas substâncias e estudada a família LiMPO4 (M: Mn, Fe, Co, Ni) em particular. Este trabalho focou particularmente no composto de Mn, LiMnPO4, onde foram utilizados os dados existentes e os recém obtidos de espalhamento inelástico de nêutrons (INS), magnetização, espalhamento Raman e ressonância paramagnética eletrônica (ESR) para modelar as interações magnéticas presentes no material. Os resultados obtidos em monocristais deste composto permitem refinar o conhecimento das interações magnéticas do mesmo. O modelo desenvolvido realiza um ajuste simultâneo dos novos dados de espalhamento Raman e os já publicados de INS, mostrando uma clara interpretação do papel dos parâmetros de troca no material escolhido. É esperado que este cálculo seja estendido para toda a família e para outros compostos. Esta tese tenta ser auto-contida, por isso incluiu-se boa parte do material necessário para o leitor e futuros continuadores deste trabalho
Abstract: This work is devoted to the study of an special type of strongly correlated electrons\' compounds, namely the multiferroics. We analyze theoretically those substances, and we study a particular family of them, the LiMPO4 (M: Mn, Fe, Co, Ni) family. We focus particularly in the Mn compound, LiMnPO4, where we use existing and newly obtained data from Inelastic Neutron Scattering, Magnetization, Raman Scattering and Electron Spin Resonance to model the magnetic interactions in the material. The results in single crystals of this compound allow us to refine the knowledge of the magnetic interactions in LiMnPO4. Our model develops a calculation that fits together the new Raman experiments and the already published INS, arriving to a clear interpretation of the role of the exchange parameters in the chosen material. We expect that our calculation will be extended in the future to the whole family and to other compounds. This thesis tried to be self-contained, so we included some material that can be useful for the readers and future continuators of this work
Doutorado
Física
Doutor em Ciências
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33

Khaywah, Mohammad Yehia. "New ultrasensitive bimetallic substrates for surface enhanced Raman scattering." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0041/document.

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Afin de développer des capteurs ultrasensibles des substrats fiables pour la diffusion Raman exaltée de surface (SERS) ont été fabriqués. Les deux meilleurs candidats de matériaux constituant les nanoparticules pour des substrats SERS sont l’argent et l’or. L’argent présente un meilleur facteur d’exaltation de l'intensité Raman et l’or est stable dans les milieux biologiques. C’est pourquoi la combinaison de ces deux métaux dans des nanostructures bimétalliques semble être une approche prometteuse qui combine les propriétés de surface de l’or et d’exaltation de l’argent. Le recuit thermique des couches métalliques minces est utilisé comme une technique simple et peu coûteuse. Cette dernière permet d’élaborer des substrats homogènes et reproductibles de nanoparticules bimétalliques or-argent ayant un facteur d’exaltation importante. Ces nanoparticules gardent leurs propriétés d’exaltation même après une année de fabrication. En jouant sur la composition de nanoparticules bimétalliques il est possible d’avoir une résonance de plasmons de surface localisés (LSPR) sur tout le spectre visible. Ces substrats sont caractérisés par une exaltation SERS supérieure lorsque la résonance plasmon est plus proche de la longueur d'onde d'excitation Raman. En outre, les nanoparticules bimétalliques de différentes tailles, compositions ont été réalisés par lithographie électronique. L’étude systématique de leurs propriétés plasmoniques et de leur exaltation SERS a révélé une conservation du lien entre résonance plasmon et signal SERS
Driven by the interest in finding ultrasensitive sensors devices, reliable surface enhanced Raman scattering (SERS) based substrates are fabricated. Silver and gold nanoparticles are two of the best candidates for SERS substrates where Ag nanoparticles exhibit large enhancing ability in Raman intensity while Au nanostructures are stable in biological systems. Hence, combining the two metals in bimetallic nanostructures appeared to be a promising approach in order to sum the merits of Au surface properties and Ag enhancing ability. Thermal annealing of thin metallic films is used as a simple and relatively inexpensive technique to elaborate homogenous and reproducible Ag/Au bimetallic nanoparticles SERS substrates with high enhancing ability. The fabricated nanoparticles proved their enhancing stability even after one year of fabrication. Manipulating the composition of Ag/Au bimetallic NPs resulted in tuning the Localized Surface Plasmon Resonance (LSPR) over the whole visible spectrum, where the substrates are characterized with higher SERS enhancement when they exhibit LSPR closer to the Raman excitation wavelength. Additionally, bimetallic nanoparticles patterns with different size, composition and lattice constants have been conducted by electron beam lithography. The systematic study of their interesting plasmonic and SERS enhancing properties revealed maintenance in the LSPR-SERS relation by changing the nanoparticle size
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34

Xue, Jiadan. "Time-resolved resonance raman and density functional theory studies of selected arylnitrenium ions and their reactions with guanosine derivatives and aryl azides." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41290914.

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35

Kan, Tze-wai Jovi. "Development of new polymer-supported reagents for organic synthesis, solvent effects in samarium promoted allylic alcohol cyclopropanation reactions and time resolved resonance studies of the photodeprotection of p-hydroxyphenacyl caged phototrigger compounds." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37925660.

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36

Kranert, Christian. "Investigation of wide-bandgap semiconductors by UV Raman spectroscopy: resonance effects and material characterization." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-160062.

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Die vorliegende Arbeit befasst sich mit der Untersuchung von weitbandlückigen Halbleitern mittels Raman-Spektroskopie. Diese wurde vorwiegend unter Verwendung von Licht einer Wellenlänge von 325 nm im ultravioletten Spektralbereich angeregt. Damit konnten zum einen aufgrund eines erhöhten Streuquerschnittes Messungen zur Probencharakterisierung durchgeführt werden, die mit Anregung im sichtbaren Spektralbereich nicht möglich gewesen wären. Zum anderen wurden bei dieser Anregungswellenlänge auftretende Resonanzeffekte untersucht. Dabei werden zwei verschiedene Materialsysteme behandelt: zum einen Kristalle mit Wurtzitstruktur und zum anderen binäre und ternäre Sesquioxide mit Metallionen der III. Hauptgruppe. An den Kristallen mit Wurtzitstruktur wurde die Streuung des Anregungslichts mit Energie oberhalb der Bandlücke an longitudinal-optischen (LO) Phononen untersucht. Die Streuung an einzelnen LO-Phononen wird unter diesen Anregungsbedingungen von einem Prozess dominiert, der eine elastische Streuung beinhaltet, durch die die Impulserhaltung verletzt wird. Es wurde ein Modell aufgestellt, dass zwischen einer elastischen Streuung an der Oberfläche und an Punktdefekten unterscheidet, und mit Hilfe von Experimenten verifiziert. Weiterhin wurde der Einfluss von Ladungsträgern auf die Energie der LO-Phononen untersucht und es wird eine Anwendung dieser Erkenntnisse zur Charakterisierung der Oberfläche von Zinkoxid vorgestellt. An den binären Oxiden des Galliums und Indiums wurden die Energien der Phononenmoden ermittelt und die resonante Verstärkung bei der verwendeten Anregungswellenlänge untersucht. Für das Galliumoxid wurde dabei insbesondere die Anisotropie des Materials berücksichtigt. Für das Indiumoxid wird dargestellt, dass durch die resonante Anregung alle Phononenmoden beobachtet werden können, was insbesondere auch die Bestimmung der Phononenmoden von Dünnschichtproben ermöglicht. Weiterhin waren Mischkristalle des Galliumoxids Untersuchungsgegenstand, in denen das Gallium teilweise durch Indium oder Aluminium ersetzt wurde. Die Phononenenergien wurden in Abhängigkeit der Zusammensetzung ermittelt und der Einfluss von strukturellen Eigenschaften darauf sowie das Auftreten von Phasenübergängen untersucht.
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37

Xue, Jiadan, and 薛佳丹. "Time-resolved resonance raman and density functional theory studies ofselected arylnitrenium ions and their reactions with guanosinederivatives and aryl azides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41290914.

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38

Kan, Tze-wai Jovi, and 簡紫慧. "Development of new polymer-supported reagents for organic synthesis, solvent effects in samarium promoted allylic alcohol cyclopropanationreactions and time resolved resonance studies of the photodeprotectionof p-hydroxyphenacyl caged phototrigger compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37925660.

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39

BOTTARI, CETTINA. "Solvation effects of ionic liquid/water mixtures on biomolecules." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2960827.

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onic liquids (ILs) belong to a broad class of ionic compounds that, differently from conventional salts, are usually liquid at T < 100°C. They are characterized by vanishing vapour pressure, good thermal stability, high ion density and ionic conductivity. Thanks to the large variety of available ions, the physico-chemical properties of ILs can be modulated by careful selection of both cation and anion with specic characteristics for tailored applications. A more convenient strategy for an ecient tuning of the performances of ILs consists in mixing ILs with other ionic or molecular liquids, such as e.g. water. It is observed that addition of water to ILs allows to improve some of their properties and performances, especially for applications in biological eld. For instance, recent studies reported on the capability of IL/water solutions to enhance the structural stability of proteins, enzymes and deoxyribonucleic acid (DNA) also at high temperatures. This PhD thesis aims to show the usefulness of synchrotron-based UV Resonance Raman (SR-UVRR) spectroscopy for investigating i) the structural dynamics of IL/water solutions and ii) the solvation effects of these IL-based solvents on bio-molecules, such as peptides and DNA. UVRR exhibits several advantages with respect to conventional spontaneous Raman spectroscopy, as the signicant increment of the detection limit that allows to study the samples in very high diluted conditions and the selective enhancement of the Raman cross section of vibrations associated to specic molecular groups of the same system. Thanks to the unique tunability of the synchrotron emission, the UVRR spectra of aqueous solutions of imidazolium-based ILs have been excited at different wavelengths nely matching with the resonance transitions occurring in the system. These spectra showed to have good sensitivity to the modications induced on the local structure of solutions of ILs by i) the change of the anion and ii) the substitution on the imidazolium ring of progressively longer alkyl-chains. Additionally, some UVRR signals are specically informative on the effect induced by addition of water on the strength of hydrogen bonds (H-bonds) in IL-water solutions. The molecular view provided by SR-UVRR experiments has been further complemented by the structural parameters extracted by Small Angle Neutron Scattering (SANS) measurements performed on the same IL/water mixtures. The investigation of the structure-dynamic relationship in IL/water solutions is the preliminary step for the deep comprehension of the effects of these mixtures on the solvation dynamics of molecules of biological interest, such as peptides and DNA. This is an issue of special interest by considering that the solute-solvent interactions are strongly related to the biological activity of bio-macromolecules. Some results will be presented in this thesis, concerning the case of two dierent type of bio-systems: i) small peptides dissolved in IL/water solutions: the UVRR spectra of peptides contain several spectroscopic markers of the structural rearrangement induced by the hydration shell on peptides, such as the Amide bands that are usually not well detectable in spontaneous Raman spectra. The analysis of these spectral features can provide insights on the peculiar effect induced on the hydration dynamics of peptides by dfferent ILs; ii) DNA dissolved in IL/water solutions: a suitable choice of the exciting radiation allows to collect UVRR spectra of DNA where the vibrational signals associated to the different nitrogenous bases are selectively enhanced. This gives the unique opportunity to disentangle specic bands in the Raman spectra of DNA that appear usually very complex. Such approach can be conveniently used to obtain insights on the molecular mechanism responsible of the dierent thermal stability exhibited by DNA structure in the presence of different IL/water solutions.
Ionic liquids (ILs) belong to a broad class of ionic compounds that, differently from conventional salts, are usually liquid at T < 100°C. They are characterized by vanishing vapour pressure, good thermal stability, high ion density and ionic conductivity. Thanks to the large variety of available ions, the physico-chemical properties of ILs can be modulated by careful selection of both cation and anion with specic characteristics for tailored applications. A more convenient strategy for an ecient tuning of the performances of ILs consists in mixing ILs with other ionic or molecular liquids, such as e.g. water. It is observed that addition of water to ILs allows to improve some of their properties and performances, especially for applications in biological eld. For instance, recent studies reported on the capability of IL/water solutions to enhance the structural stability of proteins, enzymes and deoxyribonucleic acid (DNA) also at high temperatures. This PhD thesis aims to show the usefulness of synchrotron-based UV Resonance Raman (SR-UVRR) spectroscopy for investigating i) the structural dynamics of IL/water solutions and ii) the solvation efects of these IL-based solvents on bio-molecules, such as peptides and DNA. UVRR exhibits several advantages with respect to conventional spontaneous Raman spectroscopy, as the signicant increment of the detection limit that allows to study the samples in very high diluted conditions and the selective enhancement of the Raman cross section of vibrations associated to specic molecular groups of the same system. Thanks to the unique tunability of the synchrotron emission, the UVRR spectra of aqueous solutions of imidazolium-based ILs have been excited at diferent wavelengths nely matching with the resonance transitions occurring in the system. These spectra showed to have good sensitivity to the modications induced on the local structure of solutions of ILs by i) the change of the anion and ii) the substitution on the imidazolium ring of progressively longer alkyl-chains. Additionally, some UVRR signals are specically informative on the effect induced by addition of water on the strength of hydrogen bonds (H-bonds) in IL-water solutions. The molecular view provided by SR-UVRR experiments has been further complemented by the structural parameters extracted by Small Angle Neutron Scattering (SANS) measurements performed on the same IL/water mixtures. The investigation of the structure-dynamic relationship in IL/water solutions is the preliminary step for the deep comprehension of the effects of these mixtures on the solvation dynamics of molecules of biological interest, such as peptides and DNA. This is an issue of special interest by considering that the solute-solvent interactions are strongly related to the biological activity of bio-macromolecules. Some results will be presented in this thesis, concerning the case of two different type of bio-systems: i) small peptides dissolved in IL/water solutions: the UVRR spectra of peptides contain several spectroscopic markers of the structural rearrangement induced by the hydration shell on peptides, such as the Amide bands that are usually not well detectable in spontaneous Raman spectra. The analysis of these spectral features can provide insights on the peculiar effect induced on the hydration dynamics of peptides by different ILs; ii) DNA dissolved in IL/water solutions: a suitable choice of the exciting radiation allows to collect UVRR spectra of DNA where the vibrational signals associated to the different nitrogenous bases are selectively enhanced. This gives the unique opportunity to disentangle specic bands in the Raman spectra of DNA that appear usually very complex. Such approach can be conveniently used to obtain insights on the molecular mechanism responsible of the different thermal stability exhibited by DNA structure in the presence of different IL/water solutions.
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40

Khanafer, Maher. "Nanostructures métalliques organisées par auto-assemblage de polymère pour la détection d’espèces chimiques." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0003/document.

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Les avancées récentes de la nanofabrication ont permis de faire émerger un nouveau champ de recherche, celui des nanocapteurs. En particulier, le nanocapteur plasmonique dont le principe utilise l’effet SERS (Diffusion Raman Exaltée de Surface) commence à s’imposer. En effet, ce capteur permet d’amplifier la signature d’une molécule jusqu’à un facteur de 1012 et fournit une véritable empreinte digitale de chaque molécule. La sensibilité du capteur dépend des propriétés optiques des Nanoparticules Métalliques (NPMs) qui sont liées aux propriétés physiques et structurales de ces dernières. Ainsi, la maîtrise de la fabrication de NPMs est un réel défit pour des multiples applications nanotechnologiques. Dans ce contexte, nous avons développé une approche originale de fabrication de NPMs organisées par auto-assemblage de polymère. Il s’agit d’introduire de manière contrôlée des interactions physiques qui se manifestent lors de la fabrication par une nano-séparation de phase au sein du matériau. Ceci se traduit par un nanstructuration du polymère et une auto-organisation très spécifique du précurseur métallique qui se transforme spontanément en NPMs. Les investigations expérimentales en considérant les différents facteurs physico-chimiques impliqués, nous ont permis d’identifier les paramètres clés de cette structuration et de hiérarchiser leur influence sur les dimensions structurales et la réponse optique des NPMs. Finalement, la capacité du nanocapteur à détecter de faibles traces (<10-13 M) de polluants organiques a été démontrée
The recent advances in nanofabrication techniques have allowed for the emergence of novel sensing approaches. Amongst these various approaches, Surface Enhanced Raman Spectroscopy (SERS) via the use of plasmonic substrates has received wide-spread attention due to its many interesting proper-ties. In fact, plasmonic substrates enhance the Ra-man signal up to 12 orders of magnitude, paving the path for single molecule detection. Nevertheless, the sensitivity of this technique is strongly affected by the physical and structural properties of the metallic nanoparticles (MNPs). Thus, the mastering of the MNPs fabrication is a major challenge for various nanotechnological applications.In this context, we have developed a novel approach for the fabrication of organized NMPs through poly-mer self-assembly. The fabrication technique con-sists on controlling the physical interactions which occur during the fabrication through a nanophase separation in the polymer solution. This results in a nanostructuring of the polymer and a strong self-organization of the metallic precursor which is rapidly reduced into the MNPs. Experimental investigations of the different physical and chemical processes in play allow for a better understanding of the various keystone parameters of the nanostructuring as well as for determining their influences on the dimensions and optical response of MNPs. Finally, the fabricated plasmonic substrate demonstrated SERS limits of detection down to 10-13 M
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41

Schleifenbaum, Frank. "Energy transfer in the red fluorescent protein DsRed in confined optical fields." Berlin Rhombos, 2008. http://d-nb.info/989862895/04.

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42

Zin, Melvin T. "Self-assembly and nanofabrication approaches towards photonics and plasmonics /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/15502.

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43

Wu, Tsunghsueh Shannon Curtis. "Surface plasmon assisted spectroscopies and their application in trace element analysis, the study of biomolecular interactions, and chemical sensing." Auburn, Ala., 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Chemistry_and_Biochemistry/Dissertation/Wu_Tsung%20Hsueh_20.pdf.

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44

Ludemann, Michael. "In situ Raman-Spektroskopie an Metallphthalocyaninen: Von ultradünnen Schichten zum organischen Feldeffekttransistor." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-206568.

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Im ersten Teil der Arbeit werden Signalverstärkungsmechanismen für Raman-Spektroskopie erschlossen und evaluiert. Die als geeignet bewerteten Methoden finden im zweiten Teil ihre Anwendung zur Untersuchung der vibronischen Eigenschaften von dünnen Manganphthalocyaninschichten, die anschließend mit Kalium interkaliert werden. Hierbei sind verschiedene Phasen identifizierbar, die ein ganzzahliges Verhältnis von Kaliumatomen zu Manganphthalocyaninmolekülen besitzen. Im dritten Teil werden die elektrischen Eigenschaften durch die Verwendung dieses Materialsystems als aktives Medium eines Feldeffekttransistors untersucht.
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45

Zheng, Xuming. "Resonance Raman intensity analysis studies of bond selective electronic excitation in 1,2-dihaloethanes and conformational effects on the A-band short-time photodissociation dynamics of 1-iodopropane, iodocyclohexane and iodocyclopentane /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21929440.

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46

Nardou, Éric. "Nanoparticules métalliques en matrices vitreuses pour l’amplification Raman." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10207/document.

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Les fibres optiques utilisées pour le transfert d’information présentent des pertes de signal pendant leur propagation. Ainsi, ces signaux ont besoin d’être régulièrement amplifiés. De nos jours, l’Amplification Raman, basée sur le principe de diffusion Raman stimulée, est une des techniques utilisées pour réaliser ces amplifications. Les nanoparticules de métaux nobles ont des propriétés optiques uniques provenant de l’oscillation collective des électrons lorsqu’elles interagissent avec une onde électromagnétique. Ces particules absorbent fortement le champ électromagnétique à une fréquence appelée fréquence de résonance de plasmon de surface. Ce travail de thèse concerne l’influence des nanoparticules métalliques sur l’amélioration de l’Amplification Raman. Il s’inscrit dans le cadre du projet ANR Fenoptic (2010-2012), réunissant l’entreprise Draka et plusieurs laboratoires français (ICB Dijon, CMCP Paris, LPCML Lyon), qui s’intéressent à l’intégration des nanoparticules de métaux nobles à l’intérieur des fibres optiques afin d’utiliser la résonance de plasmon de surface pour améliorer l’efficacité des amplificateurs optiques. Dans ce travail, différentes sources de nanoparticules métalliques ont été examinées (suspensions, couches, préformes de fibre optique). Les expériences ont porté sur la caractérisation (forme et position du plasmon) de nanoparticules de métaux nobles incluses en matrices vitreuses ainsi que sur des mesures de spectroscopie Raman au travers desquelles le phénomène de Diffusion Raman Exaltée de Surface (SERS) a particulièrement été étudié. Pour la première fois, nous avons mis en évidence l’exaltation du signal Raman d’une matrice vitreuse
Signals in optical fibers used for the transfer of information are attenuated due to impurities, scattering, absorption… To compensate for these losses, several techniques were developed like Erbium Doped Fiber Amplifier (EDFA). An alternative to rare earth doped fiber amplifier is Raman Amplification, which results from stimulated Raman scattering. Noble metal nanoparticles have optical properties induced by the collective oscillation of their conduction electrons when they interact with an electromagnetic wave. These particles strongly absorb the electromagnetic field at a frequency called surface Plasmon resonance frequency. This work is mainly based on effects leading to the improvement of the Raman Amplification. The ANR project Fenoptic (2010-2012), gathering Draka and several French laboratories (ICB (Dijon), CMCP (Paris), LPCML (Lyon)) is interested in the integration of noble metal nanoparticles in optical fibers using properties of the surface Plasmon resonance to improve the efficiency of optical amplifiers. In this work, different kinds of samples (suspensions, layers, optical fiber performs) with metal nanoparticles were studied. The experiments were based on the characterization (form and position of the Plasmon band) of noble metal nanoparticles in amorphous matrix and Raman spectroscopy was used to study the Surface Enhanced Raman Spectroscopy (SERS) effect. For the first time, we found the Raman signal exaltation of an amorphous matrix
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47

Liu, Quan. "Enhanced Emission of a Single Quantum Emitter Coupled to a Microcavity and a Nanocavity." Thesis, Troyes, 2021. http://www.theses.fr/2021TROY0029.

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Le développement de techniques basées sur une seule molécule au cours des dernières décennies a permis de sélectionner, de suivre et de mesurer directement une molécule individuelle. Dans cette thèse, la dynamique structurelle d'un seul émetteur quantique, servi par l'hypéricine, est caractérisée. En utilisant la microscopie à balayage confocale combinée à des modes laser polarisés radialement / azimutalement, une réorientation tridimensionnelle du moment dipolaire de transition d'une seule molécule est observée. Pour quantifier les propriétés temporelles de la tautomérie, la fonction d'autocorrélation des photons est utilisée pour extraire les fluctuations d'intensité. Les résultats montrent l'influence distincte de l'environnement local, comme la matrice PVA et l'effet de deutération. L'environnement photonique local d'une molécule est modifié par la microcavité / nanocavité. Un changement significatif du taux d'émission radiatif et des spectres de fluorescence est discuté. Il nous permet de mesurer le rendement quantique absolu en utilisant une microcavité accordable. Les résultats montrent la possibilité de contrôler la tautomérisation en modifiant l'environnement photonique. Par la suite, la dissociation moléculaire est discutée par des spectres Raman améliorés en surface à molécule unique bénéficiant de l'amélioration en champ proche de la nanocavité. Une stratégie d'optimisation expérimentale rapide vers une amélioration optimale de la fluorescence est décrite
The development of single molecule-based techniques in the last decades has enabled directly selecting, tracking, and measuring an individual molecule. In this thesis, the structural dynamics of a single quantum emitter, served by hypericin, is characterized. By using confocal scanning microscopy combined with radially/azimuthally polarized laser modes, three-dimensional reorientation of the transition dipole moment of a single molecule is observed. To quantify the temporal properties of the tautomerism, photon autocorrelation function is used to extract the intensity fluctuations. The results show the distinct influence of the local environment, such as PVA matrix and deuteration effect. The local photonic environment of a molecule is modified by the microcavity/nanocavity. A significant change of the radiative emission rate and of the fluorescence spectra is discussed. It allows us to measure the absolute quantum yield by using a tunable microcavity. The results show the possibility of controlling tautomerization by changing the photonic environment. Subsequently, molecular dissociation is discussed by single molecule surface-enhanced Raman spectra profiting from near field enhancement of nanocavity. A fast experimental optimization strategy towards optimal fluorescence enhancement is outlined
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Kranert, Christian [Verfasser], Marius [Akademischer Betreuer] Grundmann, Marius [Gutachter] Grundmann, and Dietrich [Gutachter] Zahn. "Investigation of wide-bandgap semiconductors by UV Raman spectroscopy: resonance effects and material characterization / Christian Kranert ; Gutachter: Marius Grundmann, Dietrich Zahn ; Betreuer: Marius Grundmann." Leipzig : Universitätsbibliothek Leipzig, 2015. http://d-nb.info/1239423187/34.

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49

Montagnac, Gilles. "Spectroscopie Raman résonnante UV in situ à haute température ou à haute pression." Thesis, Lyon, École normale supérieure, 2012. http://www.theses.fr/2012ENSL0784/document.

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Dans cette thèse, la spectroscopie Raman résonante UV (SRRUV) est appliquée pour la première fois à l'étude ‘in situ’ de matériaux carbonés à très haute température (> 2000 K) ou à haute pression (< 1 GPa).La thèse est constituée de trois parties. La première aborde notre travail de caractérisation en SRRUV (1) de films semi conducteurs de diamants ultra-nano-cristalins, (2) des kérogènes issues de météorites chondritiques et de charbons, et (3) des tholins, échantillons de carbone-hydrogène-azote, synthétisés comme analogues de l'atmosphère de Titan.L’intérêt pour ces phases du carbone en planétologie et en science des matériaux nous a poussé à mettre en œuvre leur étude ‘in situ’ en SRRUV. La seconde partie de la thèse est consacrée au développement d'une platine chauffante, grâce à laquelle les spectres Raman du graphite sous sa forme pyrolitique et HOPG ont été mesurés jusqu'à 2700 K. Ces données valident les modèles anharmoniques théoriques d’interaction électron-phonon et phonon-phonon. Le spectre Raman du graphite a été étalonné en fonction de la température et devient un « thermomètre » à très haute température.Dans la troisième partie de cette thèse, une presse à enclumes opposées a été modifiée pour suivre en SRRUV les changements structuraux de cristaux moléculaires très luminescents. Les vibrations intramoléculaires du cristal de pérylène sont étudiées sous pression par SRRUV. Ce composé est un cristal formé de molécules organiques polyaromatiques, avec des propriétés de semi-conducteur. Les effets de la pression sur certains modes de vibrations sont non linéaires et mettent en évidence des changement structuraux et de planéité de la molécule
I applied UV resonant Raman spectroscopy (UVRRS) to an ‘in situ’ study of carbon materials at very hight temperature (> 2000 K) or at high pressure (< 1 GPa).The advantages of UVRRS are presented in the first part of this PHD thesis, and used to investigate details of the composition and structure of disordered carbon materials such as: (1) n-type nanocrystalline films, (2) carbonaceous matter in chondrites and (3) tholins, HCN synthetic samples of Titan 's atmosphere.‘In situ’ Raman studies are limited to 2000 K by the visible black-body emission. I designed a high temperature cell to perform UVRRS above this limit. The second part of the manuscript presents Raman spectra of pyrolitic graphite and HOPG up to 2700 K. This data are consistent with anharmonic models up to 900 K, and show the coupling effects of electron-phonon and phonon-phonon. The last one dominates the anharmonicity above 1000 K. The Raman spectra was calibrated as a function of temperature and became a “thermometer” up to 2700 K.For high pressure measurements in the third part, I modified an anvil cell to study by UVRRS, the vibrational changes induced by pressure on very luminescent molecular organic crystals. I present an analysis at 244 nm of resonant Raman modes of perylene crystal under hydrostatic pressure up to 0.8 GPa. Some of them have a non linear feature under pressure, revealing structural and planar modifications of the molecules
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50

Faraj, Achraf Al. "Biodistribution and biological impact of nanoparticles using multimodality imaging techniques : (Magnetic resonance imaging)." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00696221.

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As novel engineered nanoparticles such as single-walled carbon nanotubes (SWCNT) are extensively used in nanotechnology due to their superior properties, it becomes critical to fully understand their biodistribution and effect when accidently inhaled. There fore, development of animaging technique which allow longitudinal in vivo follow-up of SWCNT effect based on their intrinsic properties is highly desirable. Non invasive free-breathing hyperpolarized 3He lung MRI protocol was developed complementary to proton systemic MR protocol to allow monitoring SWCNT based on their intrinsic iron impurities after intrapulmonary exposition. Combined toproton lung MRI and ex vivo optical and electron microscopy at different time points, this protocol represents a powerful multimodality imaging techniques which allows a full characterization of the biodistribution and biological impacts of iron containing SWCNT. SWCNT was found to produce granulomatous and inflammatory reactions in a time and dose dependent manner with their bio persistenc eafter intrapulmonary exposition.From biological impact evaluations after intrapulmonary exposition towards biomedical applications, SWCNT hold promise for applications in nanomedicine field with their distinct architecture and their novel physicochemical properties. The biodistribution and pharmacological profile of various well-dispersed pristine and functionalized SWCNT were assessed in blood and target tissues after their intra venous administration by longitudinal in vivo susceptibility weighted MRI and their potential effect on liver metabolism by ex vivo HRMAS 1H NMR. No presence ofacute toxicological effect (variation in liver metabolism) was observed confirmed by the absence of clustering in NMR spectra using Principal Component Analysis (specific biomarkers of toxicity).
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