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Dissertations / Theses on the topic 'Femtosecond Time-resolved Raman Spectroscopy'

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Published: 6 September 2023

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1

Philpott, Matthew Perry. "Time-resolved resonance Raman and femtosecond pump-probe study of chlorine dioxide (OClO) photochemistry in solution /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/8555.

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2

Kovac, Philip. "Exploring time-dependent approaches towards the calculation of dynamics and spectroscopic signals: A mixed quantum/semiclassical wave packet method and the theory of transient absorption and femtosecond stimulated Raman scattering." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23124.

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We present a time-dependent mixed quantum/semiclassical approach to calculating linear absorption spectra. Applying Variational Fixed Vibrational Basis/Gaussian Bath theory (FVB/GB) to the treatment of small molecules isolated in an extended cryogenic medium, an assumed time-scale separation between the few rapid, largely intramolecular modes of the guest and the several slower extended modes of the medium is utilized to partition a system from the surrounding bath. The system dynamics are handled with basis set methods, while the bath degrees of freedom are subject to a semiclasscial thawed Gaussian ansatz. The linear absorption spectrum for a realistic model system is calculated using FVB/GB results and then compared with a numerically exact calculation. Also contained in this dissertation are previously published theoretical works on Transient Absorption and Femtosecond Stimulated Raman Spectroscopy. Both encompass a rebuilding of the theory and elucidate the information content of the respective spectroscopic signals. This dissertation includes previously published co-authored material.
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3

Williams, Leah Ruby. "Femtosecond time-resolved spectroscopy of organic molecular crystals." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14589.

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4

Ekvall, Karin. "Time resolved laser spectroscopy." Doctoral thesis, KTH, Physics, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3063.

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5

Tatham, Martin Christopher. "Time resolved Raman spectroscopy of semiconductor structures." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305429.

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6

Jerebtsov, Serguei Nikolaevich. "Femtosecond time-resolved spectroscopy of coherent oscillations in nanomaterials." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1358.

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7

Šiffalovič, Peter. "Femtosecond time resolved photoelectron spectroscopy in the extreme ultraviolet region." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964973502.

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8

McCleese, Christopher. "Femtosecond Time-Resolved Spectroscopy Studies of Interfacial Charge Separation Processes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case149182204612303.

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9

Hayes, Gary Robert. "Ultrafast relaxation processes in semiconductors studied by femtosecond time-resolved photoluminescence spectroscopy." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263051.

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10

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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11

Rooney, Denise. "Time-resolved raman spectroscopy and photolysis of transition metal carbene complexes." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334489.

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12

Hayes, Sophia Charalambous. "Chlorine dioxide photochemistry in solution : time-resolved resonance Raman and femtosecond pump-probe studies /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/11614.

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13

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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14

Li, Wen, and 李闻. "Resonance Raman and time-resolved spectroscopic studies of selected chlorobenzophenone and fluoroquinolones." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48079741.

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Nanosecond time-resolved resonance Raman (ns-TR3) spectroscopy was used in this thesis to study the photoreduction reactions and the photochemistry of chloro-substituted benzophenone (ClBP) triplets. The 3-chlorobenzophenone (3-ClBP), 4-chlorobenzophenone (4-ClBP) and 4,4′-dichlorobenzophenone (4,4′-diClBP) triplets exhibit similar properties to the parent BP triplet. In isopropyl alcohol (IPA), the hydrogen abstraction reactions were observed for the 3-ClBP, 4-ClBP and 4,4′-diDlBP triplets. The diphenylketyl (DPK) radicals produced from the hydrogen abstraction reactions were observed and the recombination of the DPK and dimethylketyl radicals at the para-position was observed to form a light absorption transient (LAT) species. In MeCN:H2O/1:1 aqueous solutions, these DPK radicals were also observed but with a slower formation rate and the LAT species was produced by reaction with OH radicals. Density functional theory (DFT) calculations were employed to help identify the intermediates seen in the TR3 spectra and to help provide information about the vibrational motions of the molecules examined. The 2-Cl-DPK radical was also observed in the TR3 spectra obtained in an IPA solvent. However, the yield of the 2-Cl-DPK radical and the hydrogen abstraction rate was observed to be significantly lower than that of the other ClBP examined here under the same experimental conditions. The results DFT calculations show that the 2-chloro substituent changes the geometry and the electron density of the molecular orbitals of the BP triplet so that the 2-chloro substituent reduces the hydrogen abstraction ability the triplet state, which is different the hypothesis put forward by some previous studies that an electron-withdrawing group should increase the photoreduction ability of BP derivatives. Norfloxacin (NF) and Enoxacin (EN) are representative derivatives of Fluoroquinolones (FQ). There are four forms of NF and EN and these different forms can coexist in aqueous solutions. The UV-vis absorption and resonance Raman (RR) spectra of NF and EN have been obtained in neat acetonitrile (MeCN), MeCN:HClO4-H2O/1:1 (pH?1), MeCN:H2O/1:1 (pH?7.5) and MeCN:NaOH-H2O/1:1 (pH?13) solutions. The species observed in the spectra are assigned by comparison of the experimental spectra to the DFT calculated spectra and the vibrational modes are also described from the results of the DFT calculations. The absorption spectra of NF and EN obtained in MeCN:H2O/1:1 solutions show that some other species coexist with the tautomeric forms in the neutral aqueous solution. The RR spectra of the tautomeric forms of NF and EN were obtained by subtraction of the RR spectra of the neutral and anionic forms from the RR spectra of NF and EN in neutral aqueous solutions. The results suggest that NF and EN exists in neutral, anionic and tautomeric forms in neutral aqueous solutions. The time dependant DFT calculation results suggest that the fluorine atom has little contribution to the lowest unoccupied molecular orbitals of the different forms of NF and EN.
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15

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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16

Pestov, Dmitry Sergeyevich. "Detection of bacterial endospores by means of ultrafast coherent raman spectroscopy." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85958.

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This work is devoted to formulation and development of a laser spectroscopic technique for rapid detection of biohazards, such as Bacillus anthracis spores. Coherent anti-Stokes Raman scattering (CARS) is used as an underlying process for active retrieval of species-specific characteristics of an analyte. Vibrational modes of constituent molecules are Raman-excited by a pair of ultrashort, femtosecond laser pulses, and then probed through inelastic scattering of a third, time-delayed laser field. We first employ the already known time-resolved CARS technique. We apply it to the spectroscopy of easy-to-handle methanol-water mixtures, and then continue building our expertise on solutions of dipicolinic acid (DPA) and its salts, which happen to be marker molecules for bacterial spores. Various acquisition schemes are evaluated, and the preference is given to multi-channel frequency-resolved detection, when the whole CARS spectrum is recorded as a function of the probe pulse delay. We demonstrate a simple detection algorithm that manages to differentiate DPA solution from common interferents. We investigate experimentally the advantages and disadvantages of near-resonant probing of the excited molecular coherence, and finally observe the indicative backscattered CARS signal from DPA and NaDPA powders. The possibility of selective Raman excitation via pulse shaping of the preparation pulses is also demonstrated. The analysis of time-resolved CARS experiments on powders and B. subtilis spores, a harmless surrogate for B. anthracis, facilitates the formulation of a new approach, where we take full advantage of the multi-channel frequency-resolved acquisition and spectrally discriminate the Raman-resonant CARS signal from the background due to other instantaneous four-wave mixing (FWM) processes. Using narrowband probing, we decrease the magnitude of the nonresonant FWM, which is further suppressed by the timing of the laser pulses. The devised technique, referred to as hybrid CARS, leads to a single-shot detection of as few as 104 bacterial spores, bringing CARS spectroscopy to the forefront of potential candidates for real-time biohazard detection. It also gives promise to many other applications of CARS, hindered so far by the presence of the overwhelming nonresonant FWM background, mentioned above.
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17

Sundarajoo, Shankaran. "Deep Raman Spectroscopy in the analytical forensic investigation of concealed substances." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61022/1/Shankaran_Sundarajoo_Thesis.pdf.

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Deep Raman Spectroscopy is a domain within Raman spectroscopy consisting of techniques that facilitate the depth profiling of diffusely scattering media. Such variants include Time-Resolved Raman Spectroscopy (TRRS) and Spatially-Offset Raman Spectroscopy (SORS). A recent study has also demonstrated the integration of TRRS and SORS in the development of Time-Resolved Spatially-Offset Raman Spectroscopy (TR-SORS). This research demonstrates the application of specific deep Raman spectroscopic techniques to concealed samples commonly encountered in forensic and homeland security at various working distances. Additionally, the concepts behind these techniques are discussed at depth and prospective improvements to the individual techniques are investigated. Qualitative and quantitative analysis of samples based on spectral data acquired from SORS is performed with the aid of multivariate statistical techniques. By the end of this study, an objective comparison is made among the techniques within Deep Raman Spectroscopy based on their capabilities. The efficiency and quality of these techniques are determined based on the results procured which facilitates the understanding of the degree of selectivity for the deeper layer exhibited by the individual techniques relative to each other. TR-SORS was shown to exhibit an enhanced selectivity for the deeper layer relative to TRRS and SORS whilst providing spectral results with good signal-to-noise ratio. Conclusive results indicate that TR-SORS is a prospective deep Raman technique that offers higher selectivity towards deep layers and therefore enhances the non-invasive analysis of concealed substances from close range as well as standoff distances.
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18

Stevens, Jeffrey Alan. "Time Resolved Femtosecond Optical Studies of Heme Proteins Myoglobin and Cytochrome c." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299604642.

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19

Pietzsch, Annette. "Towards femtosecond time resolved electron spectroscopy for chemical analysis: core level photoelectron spectroscopy on solids at free electron lasers." München Verl. Dr. Hut, 2008. http://d-nb.info/990811220/04.

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20

Brack, Terry. "Picosecond time-resolved resonance Raman spectroscopy of the primary products in the bacteriorhodopsin photocycle." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185046.

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The initial photochemical and photophysical events of the Bacteriorhodopsin (BR) photocycle are investigated using resonance Raman spectroscopy. The salt water bacterium, Halobacterium halobium, converts light into chemical energy via this cycle. Light induced isomerization of the all-trans retinal chromophore causes proton translocation across the lipid membrane containing the protein. Absorption experiments reveal red shifts in BR absorption on a picosecond time scale. Picosecond time-resolved resonance Raman spectroscopy (PTR³) provides a vibrational probe of these changes. PTR³ utilizes two tunable dye lasers in a pump-probe configuration. One initiates photochemistry while a second probes the chromophore. The vibrational spectrum of the K-590 intermediate present 50 ps after the initiation of the photocycle is obtained by PTR³ spectroscopy. The ability to separate photolytic excitation from the Raman probe facilitates the application of a quantitative model of the optical excitation process to time resolved vibrational measurements of K-590. These spectra are analyzed to find the isomerization state of retinal in K-590 by comparison with the resonance Raman spectra of model compounds. These resonance Raman results are compared to earlier measurements of the K intermediate. PTR³ spectra of K-590 present later in the photocycle are also obtained. These spectra remain unchanged over the period investigated (40 ps-26 ns). These results confirm that isomerization of the chromophore is one of the primary events following initiation of the photocycle. Changes in relative Raman intensities observed earlier than 40 ps are discussed with reference to the photophysics of the optical excitation process. PTR³ techniques are applied to antistokes Raman measurements of BR. The existence of a significant vibrationally excited population is revealed. Differences in the Raman band positions in the stokes and antistokes spectra demonstrate that several quanta of the higher frequency modes in the BR Raman spectrum are excited. These modes decay with a time constant of ≈7 ps. These observations suggest the retinal chromophore does not experience rapid uniform internal vibrational redistribution following the internal conversion producing the vibrationally excited species.
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21

Maksimenka, Raman. "Techniques in frequency conversion and time-resolved spectroscopy with nonlinear optical processes in the femtosecond regime." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976092263.

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22

Day, Mark A. "Femtosecond time-resolved pump-probe spectroscopy on electron transfer in mono- and polynucleotides and in DNA." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414155.

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23

de, La Harpe Kimberly Desneiges. "Femtosecond UV and Infrared Time-Resolved Spectroscopy of DNA: From Well-ordered Sequences to Genomic DNA." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299527926.

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24

Paik, Daniel Hern McKoy Vincent Zewail Ahmed H. "Femtosecond time-resolved spectroscopy of anionic systems : dynamics of mesoscopic systems and gas-phase organic reactions /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05272004-213231.

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25

Middleton, Chris T. "Vibrational and Excited-State Dynamics of DNA Bases Revealed by UV and Infrared Femtosecond Time-Resolved Spectroscopy." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211937433.

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26

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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27

Staedter, David. "Femtosecond time-resolved spectroscopy in polyatomic systems investigated by velocity-map imaging and high-order harmonic generation." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2116/.

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Dans cette thèse, la dynamique de photodissociation de l'azoture de chlore (ClN3) est étudiée dans le domaine temporel par imagerie de vecteur vitesse des photofragments, spécialement du chlore et de N3. Cette imagerie résolue à l'échelle femtoseconde permet d'extraire les temps de dissociation, l'établissement temporel de la balance d'énergie de la réaction ainsi que la conservation des moments. Cette étude a permis de différencier deux domaines d'énergie: l'un menant à la formation d'un fragment N3 linéaire (étude autour de 4. 5 eV d'excitation électronique) et le plus intéressant aboutissant à la formation d'un fragment N3 cyclique (autour de 6 eV). Dans une seconde étude, la dynamique de relaxation électronique du tétrathiafulvalène (C6H4S4-TTF) est étudiée autour de 4 eV par spectroscopie de masse résolue en temps ainsi que par spectroscopie de photoélectron. Les seuils d'ionisation dissociative sont extraits d'une détection en coïncidence entre les photoélectrons de seuil et les fragments ionisés réalisée sur rayonnement synchrotron. Les deux dernières expériences sont basées sur la génération d'harmoniques d'ordre élevé dans l'XUV d'une impulsion femtoseconde à 800 nm ou à 400 nm. Dans la première expérience, les harmoniques sont couplées à un imageur de vecteur vitesse en tant que rayonnement secondaire VUV. Par imagerie de photoélectron résolue en temps, nous avons révélé ainsi les dynamiques de relaxation des états de Rydberg initiée par une impulsion femtoseconde XUV à 15. 5 eV dans l'argon et à 9. 3 eV dans l'acétylène. Dans la seconde expérience, couramment nommée spectroscopie attoseconde, les harmoniques constituent le signal pompe sonde. Deux types de spectroscopie attoseconde ont été réalisés pour étudier la dynamique vibrationnelle de SF6: une expérience en réseau transitoire créé par deux impulsions pompe Raman avec une impulsion sonde intense générant les harmoniques à partir du réseau d'excitation et une expérience d'interférence de deux rayonnement XUV en champ lointain créés par deux impulsions sonde intenses
Revealing the underlying ultrafast dynamics in molecular reaction spectroscopy demands state-of-the-art imaging techniques to follow a molecular process step by step. Femtosecond time-resolved velocity-map imaging is used to study the photodissociation dynamics of chlorine azide (ClN3). Here especially the co-fragments chlorine and N3 are studied on the femtosecond timescale in two excitation energy regions around 4. 67 eV and 6. 12 eV, leading to the formation of a linear N3 fragment and a cyclic N3 fragment, respectively. This work is the first femtosecond spectroscopy study revealing the formation of cyclic N3. Tetrathiafulvalene (TTF, C6H4S4) electronic relaxation is studied, while scanning the electronic excitation around 4 eV, by time resolved mass and photoelectron spectroscopy. As only few is known about the ion continuum about TTF the imaging photoelectron photoion coincidence (iPEPICO) technique is used in order to disentangle the complex ionic dissociation. The second part of the thesis is based on the generation and application of XUV light pulses by high-order harmonic generation with an intense femtosecond laser pulse in a molecular target. Two types of phase sensitive attosecond spectroscopy experiments were conducted to study the vibrational dynamics of SF6: one using strong field transient grating spectroscopy, where high-order harmonic generation takes place in a grating of excitation, and the second experiment using high-order harmonic interferometry using two intense XUV probe pulses. The temporal dependencies in phase and amplitude reveal the vibrational dynamics in SF6 and demonstrate that high-order harmonic generation is sensitive to the internal excitations. Last but not least, the use of high-order harmonics as a XUV photon source for the velocity-map imaging spectrometer is investigated. Using time-resolved photoelectron imaging, the relaxation dynamics initiated with 15. 5 eV in argon and 9. 3 eV in acetylene are revealed
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28

Ombinda-Lemboumba, Saturnin. "Femtosecond pump probe spectroscopy of light harvesting complexes and Phthalocyanines." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17894.

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Thesis (PhD)--Stellenbosch University, 2011.
ENGLISH ABSTRACT: The generation of ultrafast light pulses and the development of time resolved spectroscopic techniques, such as the femtosecond pump probe spectroscopy technique, have facilitated the study of ultrafast energy transfer in the photosynthetic systems of green plants and photodynamic therapy drugs. It has allowed the investigation of biological and chemical processes that take place on the ultrafast timescale and has allowed us to obtain spectral and kinetic information on energy transfer. In addition, it has allowed time resolved experiments in which the transient absorption of species under investigation was observed and has elucidated molecular dynamics. In the present work this was done with a temporal resolution of approximately 200 fs and covering a pump-to-probe delay range of 300 fs to 2 ns. The main aims of this study were to characterise the femtosecond pump probe spectroscopy system, to investigate the energy transfer in the natural light harvesting complex II (LHC II) in view of future expansion to the study of synthesized arti cial functional light harvesting complexes and nally to study ultrafast processes in zinc phthalocyanine (ZnPc) systems. In photosynthetic organisms, LHC II is the most abundant light harvesting complex and it plays an important role in light harvesting and photoprotection. The light energy is absorbed by light harvesting complexes and transferred to a reaction centre (RC) in an ultrafast timescale. Phthalocyanines are a new class of photosensitiser used for photodynamic therapy. These drugs are used to treat small and super cial tumours. The energy transfer from the singlet excited state to the triplet excited state occurs on an ultrafast timescale. However, recent work done on zinc phthalocyanine has proved that the determination of the ultrafast component remains a challenge. Several ultrafast studies carried out on ZnPc in solvents have been not only unsuccessful to give a clear picture of the ultrafast dynamics but have also produced divergent results. In this study, a characterisation of the femtosecond pump probe spectroscopy setup was done. The samples under investigation were probed by a white light continuum. The generation of the white light continuum introduced chirp, which in uenced the temporal evolution of the transient absorption results. The technique used to correct the chirp introduced by white light generation is discussed in detail. Our femtosecond pump probe spectroscopy setup was benchmarked by using a well known dye, namely malachite green. In addition, the investigation of the transient absorption change of LHC II, an active component in photosynthesis, as extracted from spinach leaves and the ultrafast dynamics of a promising photosensitiser ZnPc in dimethyl sulfoxide (DMSO) as well as in dimethyl formamide (DMF) was done. The spectral and dynamic results obtained using these three samples are described and exponential ts to the absorbance decay curves used to estimate the timescales of the energy transfer processes are presented. In this experiment, the dynamics and measured time constants related to the energy transfer between the different types of chlorophyll in LHC II was monitored, whereas with ZnPc, the dynamics and the measured time constants associated with solvation dynamics and vibrational relaxation was examined.
AFRIKAANSE OPSOMMING: Die vorming van ultravinnige lig pulse en die ontwikkeling van tyd opgelosde spektroskopiese tegnieke, soos die femtosekonde pomp proef spektroskopie tegniek, het die studie van ultravinnige energie oordrag in fotosintetiese stelsels van groen plante en chemiese prosesse gefasiliteer, wat kan plaasvind op die ultravinnige tyd skaal en laat dit toe om spektrale en kinetiese informasie oor die energie oordrag te kan bepaal. Dit het ook dit moontlik gemaak om tyd opgelosde eksperimente te kan doen waarin ons veranderlike absorbsie van die monster kon ondersoek en die molekulere dinamika kon ontrafel. In hierdie werk is dit gedoen met n tyd resolusie van omtrent 200 fs termyl 'n pomp-tot-proef tydvertraging van 300 fs tot 2 ns gebruik is. Die hoof doelwitte van hierdie werk was om 'n femtosekonde pomp proef spektroskopie stelsel te karakteriseer, die energie oordrag in die natuurlike ligoes kompleks II te ondersoek met die toekomstige uitbreiding van die studie na sintetiese lig-oes komplekse as oogmerk en laastens om ultravinnige prosesse in Sink Ftalosianiene stelsels te ondersoek. In fotosintetiese organismes, is lig oes kompleks II die mees volop lig oes kompleks en speel 'n belangrike rol in lig oes en foto skerming. Die lig energie word geabsorbeer deur lig oes komplekse en dan oorgedra na reaksie middelpunte in 'n ultravinnige tydskaal. Ftalosianiene is 'n nuwe klas fotosensiteerder wat gebruik word in fotodinamiese terapie. Hierdie dwelms word gebruik om klein en oppervlakkige gewasse te behandel. Die energie oordrag van die opgewekte singlet tot die triplet toestand vind plaas op die ultravinnige tydskaal. Onlangse navorsingswerke het getoon dat die bepaling van die ultravinnige komponent 'n uitdaging bly. Verskeie vorige ondersoeke is gedoen op Sink Ftalosianiene in verskeie oplosmiddels, en nie net het hierdie studies nie 'n helder prentjie verskaf van die ultravinnige dinamika nie, maar het ook divergerende resultate opgelewer. In hierdie werk word 'n karakterisering van die femtosekonde pomp proef spektroskopie stelsel gedoen. Die monsters is ondersoek met 'n wit lig kontinuum proef. Die vorming van die wit lig kontinuum het tjirp veroorsaak, wat die tyd evolusie van die veranderlike absorbsie resultate beinvloed het. Die tegniek wat gebruik was om die tjirp te korregeer word bespreek. Ons femtosekonde pomp proef spektroskopie stelsel is gestandardiseer deur die welbekende kleurstof malachiet groen. Ons het ook die veranderlike absorbsie van lig oes kompleks II ondersoek, 'n aktiewe komponent in fotosintese, soos dit onttrek is uit spinasie blare, asook die ultravinnige dinamika van die belowende photosensitizer Sink Ftalosianiene in DMSO asook DMF. Die spektrale en dinamiese resultate verkry vanaf hierdie drie monsters word beskryf en eksponensiele passings aan die absorbsie verval kurwes is gebruik om die tydskale van die energie oordrag prosesse te skat. In hierdie eksperiment is dinamika en gemete tydkonstantes waargeneem wat toegeskryf kan word aan die energie oordrag tussen verskillende soorte chloro l in lig oes kompleks II. In die Sink Ftalosianien eksperimente is dinamika en gemete tydkonstantes waargeneem wat toegeskryf kan word aan solverings dinamika asook vibrasionele ontspanning.
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29

Abend, Stefan. "Ultrafast dynamics of chlorins and porphyrins in proteins and solution investigated by time resolved three pulse photon echo spectroscopy." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249371.

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30

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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31

Wachsmann-Hogiu, Sebastian. "Vibronic coupling and ultrafast electron transfer studied by picosecond time resolved resonance Raman and CARS spectroscopy." Doctoral thesis, [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960830898.

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32

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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33

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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34

Zhu, Peizhi, and 朱沛志. "Time-resolved resonance Raman and density functional theory studies ofselected para-phenyl substituted arylnitrenium ions and arylnitrenes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31246370.

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35

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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36

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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37

Stange, Uta Corinna [Verfasser]. "Electronic dynamics of monomers, dimers and oligomers of purine nucleobases studied by femtosecond time-resolved spectroscopy / Uta Corinna Stange." Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1173163271/34.

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38

Nesbitt, John. "A time-resolved incoherent anti-Stokes Raman spectroscopy study of optical phonons in single-walled carbon nanotubes." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/362093/.

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This thesis presents a time-resolved incoherent anti-Stokes Raman spectroscopy (TRIARS) study of the D- G- and G'-band phonon population dynamics in single-walled carbon nanotubes (SWCNTs). The purpose of this study is to explore the mechanisms which control the decay of non-equilibrium.
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39

Grguraš, Ivanka [Verfasser], and Adrian L. [Akademischer Betreuer] Cavalieri. "Time resolved photoelectron spectroscopy for femtosecond characterization of X-ray free-electron laser pulses / Ivanka Grguraš ; Betreuer: Adrian L. Cavalieri." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1117798089/34.

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40

Grguraš, Ivanka Verfasser], and Adrian L. [Akademischer Betreuer] [Cavalieri. "Time resolved photoelectron spectroscopy for femtosecond characterization of X-ray free-electron laser pulses / Ivanka Grguraš ; Betreuer: Adrian L. Cavalieri." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1117798089/34.

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41

Rothenbach, Nico [Verfasser], and Heiko [Akademischer Betreuer] Wende. "Femtosecond time-resolved soft X-ray spectroscopy for an element-specific analysis of complex materials / Nico Rothenbach ; Betreuer: Heiko Wende." Duisburg, 2020. http://d-nb.info/1221960261/34.

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42

Cook, Samuel C. "An investigation of the excited state properties of (E)-1,2-bis(2,2'-bithiophene-5-yl)ethylene using femtosecond time resolved spectroscopy." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471346027.

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43

Chen, Jinghao [Verfasser], and Uwe [Akademischer Betreuer] Bovensiepen. "Ultrafast charge and spin dynamics at solid interfaces : Investigated with femtosecond time-resolved second harmonic spectroscopy / Jinghao Chen ; Betreuer: Uwe Bovensiepen." Duisburg, 2021. http://d-nb.info/1233966588/34.

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44

潘多海 and Duohai Pan. "Nanosecond time-resolved resonance Raman and ab initio studies of triplet states and radical cations of halobiphenyls and the radicalcations of phenothiazine, promazine, and chloropromazine." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31240860.

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45

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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46

Pan, Duohai. "Nanosecond time-resolved resonance Raman and ab initio studies of triplet states and radical cations of halobiphenyls and the radical cations of phenothiazine, promazine, and chloropromazine /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22237665.

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47

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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李昌運 and Cheong-wan Lee. "Time-resolved resonance Raman and density functional theory investigation of the T1 triplet states and radical cations ofsubstituted biphenyl compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224623.

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Wright, Peter. "Generation, Characterization and Application of the 3rd and 4th Harmonics of a Ti:sapphire Femtosecond Laser." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20628.

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Femtosecond time-resolved photoelectron spectroscopy (fsTRPES) experiments have been used to study the photoelectron energy spectra of simple molecules since the 1980’s. Analysis of these spectra provides information about the ultrafast internal conversion dynamics of the parent ions. However, ultraviolet pulses must be used for these pump-probe experiments in order to ionize the molecules. Since current solid state lasers, such as the Ti:sapphire laser, typically produce pulses centered at 800nm, it is necessary to generate UV pulses with nonlinear frequency mixing techniques. I therefore constructed an optical setup to generate the 3rd and 4th harmonics, at 266.7nm and 200nm, respectively, of a Ti:sapphire (Ti:sa) chirped-pulse amplified (CPA) laser system that produces 35fs pulses centered at 800nm. Thin Beta-Barium Borate (β-BaB2O4 or BBO) crystals were chosen to achieve a compromise between short pulse durations and reasonable conversion efficiencies, since ultrashort pulses are quite susceptible to broadening from group velocity dispersion (GVD). Output energies of around 11μJ and 230nJ were measured for the 266.7nm and 200nm pulses, respectively. The transform limits of the 3rd and 4th harmonic pulse lengths were calculated from their measured spectral widths. We found that the 266.7nm bandwidth was large enough to support sub-30fs pulses, and due to cutting at the lower-wavelength end of the 200nm spectrum, we calculated an upper limit of 38fs. The pulses were compressed with pairs of CaF2 prisms to compensate for dispersion introduced by transmissive optics. Two-photon absorption (TPA) intensity autocorrelations revealed fully compressed pulse lengths of 36 ± 2 fs and 42 ± 4 fs for the 3rd and 4th harmonics, respectively.
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Lee, Cheong-wan. "Time-resolved resonance Raman and density functional theory investigation of the T1 triplet states and radical cations of substituted biphenyl compounds." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22956311.

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