Dissertationen zum Thema „Photon spectrometry“
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Finch, Jeffrey William. „Selective mass spectrometry by single-photon ionization from a molecular hydrogen laser source“. Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185895.
Der volle Inhalt der QuelleChen, Yanfeng. „Analysis of Biological Molecules Using Stimulated Desorption Photoionization Mass Spectrometry“. Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14620.
Der volle Inhalt der QuelleBurns, Kimberly Ann. „Coupled multi-group neutron photon transport for the simulation of high-resolution gamma-ray spectroscopy applications“. Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29737.
Der volle Inhalt der QuelleCommittee Chair: Hertel, Nolan; Committee Member: Kulp, William David; Committee Member: Lee, Eva; Committee Member: Pagh, Richard; Committee Member: Petrovic, Bojan; Committee Member: Rahnema, Farzad; Committee Member: Smith, Eric; Committee Member: Wang, Chris. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Knie, André [Verfasser]. „Photon induced inner-shell excitation processes of nitrous oxide probed by angle resolved fluorescence and Auger-Electron spectrometry / André Knie“. Kassel : Kassel University Press, 2013. http://d-nb.info/1056946180/34.
Der volle Inhalt der QuelleBen, Ltaief Ltaief [Verfasser]. „Interatomic Coulombic decay in noble gas clusters of varying sizes investigated by photon-induced (dispersed) fluorescence spectrometry / Ltaief Ben Ltaief“. Kassel : Universitätsbibliothek Kassel, 2018. http://d-nb.info/1162155019/34.
Der volle Inhalt der QuelleHabib, Amr. „Détecteurs radiologiques grande surface, multi-énergie“. Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT055.
Der volle Inhalt der QuelleThe objective of the thesis is to propose a solution for a 2D integrated circuit X-ray imager working, either in spectrometric mode where each X photon energy is measured, or in charge integration mode where the total energy deposited by X-ray during an image is measured, the solution being compatible with large area detectors typically of 20 cm x 20 cm. A proof of concept prototype ASIC 'Sphinx' was designed and fabricated in CMOS 0.13 µm technology; the ASIC being formed of a matrix of 20 x 20 pixels with a 200 µm pixel pitch. The designed architecture allows the quantification of the incoming charge through the use of counter-charge packets as low as 100 electrons. The injected packets are counted for each X photon (in the spectrometric photon counting mode), or for all charges integrated during the image period (in charge integration mode). First characterization measurements prove the validity of the concept with good performance in terms of power consumption, noise, and linearity. A first part of the ASIC is dedicated to X-ray direct detection where a semiconductor, e.g. CdZnTe, hybridized to the ASIC's pixels converts X-photons to electrical charge. Another part of the ASIC is dedicated indirect X-ray detection where a scintillator, e.g. CsI:Tl, is used to convert X-photons to visible photons which are then detected by in-pixel photodiodes. For the latter mode, new forms of photodiodes characterized by fast detection and low capacity were designed, simulated, and fabricated in CMOS 0.13 µm technology on a different ASIC. Finally, the thesis concludes with proposing performance enhancing ideas to be potentially implemented in a future prototype
Varga, János [Verfasser], und Armin [Akademischer Betreuer] Reller. „Application of Thermal Analysis: Single Photon Ionization Time-of-Flight Mass Spectrometry for Studies of Inorganic Clusters and Ionic Liquids / János Varga ; Betreuer: Armin Reller“. Augsburg : Universität Augsburg, 2017. http://d-nb.info/114105390X/34.
Der volle Inhalt der QuelleNazih, Abdelhamid. „Applications de la spectroscopie par corrélation de photons à : 1) la granulométrie des imbrûlés : 2) la vélocimétrie“. Rouen, 1989. http://www.theses.fr/1989ROUES030.
Der volle Inhalt der QuelleZahir, Mostafa Lokman. „Nouvelles références en énergie X et gamma inférieures à 100 keV établies à l'aide de calorimètres magnétiques ultra haute résolution“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP125.
Der volle Inhalt der QuelleThe X and gamma rays emitted by radionuclides can be used to calibrate the energy scale of energy-dispersive detectors. This is particularly the case for cryogenic detectors, which offer excellent resolution but have non-linearities that need to be corrected. In order to calibrate these detectors accurately below 200 keV, it is necessary to have X-rays and gamma rays with an uncertainty of the order of 0.1 eV. However, recommended gamma-ray photon energies meeting this criterion are rare or based on a single experimental measurement. The main objective of this thesis is to measure gamma photons below 200 keV with excellent resolution in order to improve the uncertainties on their energies to around 0.1 eV. To meet this objective, a new cryogenic detector has been designed. It is a Metallic Magnetic Calorimeter (MMC) with eight 50 µm-thick gold absorbers covering a total surface area of 8.4 mm². An assembly was built to house: four MMC chips, two SQUID chips for reading-out the MMCs, and the printed circuits to connect them to the cables of the dilution refrigerator. The set-up also includes a cryogenic radioactive source sampler, specially designed to operate at very low temperatures and to measure up to four sources sequentially. The sources measured are mixtures of several radionuclides: three standard radionuclides used to correct the non-linearity of the MMC (169Yb, 57Co and 153Gd) and seven radionuclides used to measure their X and gamma energies with very low uncertainty (109Cd, 133Ba, 155Eu, 210Pb, 239Np, 241Am and 243Am). Mixtures of radionuclides in the sources were chosen by Monte Carlo simulations to minimise spectral interference. Ytterbium-169 was produced by irradiating a thulium foil with deuterons at the Arronax cyclotron.Two independent measurement sessions on two set of four sources were carried out at around 16 mK during two weeks, with different temperature control conditions. The energy resolution of the detector is 15 eV to 36 eV for gamma-rays between 0 keV and 200 keV. The non-linearity of each absorber was corrected using the lines of the standard radionuclides and a second-degree polynomial. The X-ray and gamma-ray energies measured were analysed and combined using various methods. Regardless ofthe measurement session and analysis method used, the energies obtained are consistent with each other, with only the uncertainties differing. In the end, the energies of 15 gamma-ray lines were measured and for 14 of them, the uncertainty obtained, around 0.2 eV, is lower than the recommended values. Eight Kα X-ray photon energies were also measured; for these well-known lines, very good agreement was observed with the recommended values, thus validating the methodology used in the work presented
Adam, Thomas [Verfasser], Ralf [Akademischer Betreuer] Zimmermann, Antonius [Akademischer Betreuer] Kettrup und Harun [Akademischer Betreuer] Parlar. „Investigation of Tobacco Pyrolysis Gases and Puff-by-puff Resolved Cigarette Smoke by Single Photon Ionisation (SPI) – Time-of-flight Mass Spectrometry (TOFMS) / Thomas Adam. Gutachter: Antonius Kettrup ; Harun Parlar. Betreuer: Ralf Zimmermann“. München : Universitätsbibliothek der TU München, 2006. http://d-nb.info/1058140760/34.
Der volle Inhalt der QuellePearson, Wright L. „The use of infrared multiple photon dissociation and Fourier transform ion cyclotron resonance mass spectrometry to study the thermochemical dynamics of dephosphorylation and the spectral and density functional theory determined structural characteristics of monosaccharide isomers“. [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024272.
Der volle Inhalt der QuelleWang, Shih-fan. „Synthesis and Characterization of Surface Relaxations of Macrocyclic Polystyrenes and Interfacial Segregation in Blends with Linear Polystyrenes“. University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1322506008.
Der volle Inhalt der QuelleSidorova, Mariia. „Timing Jitter and Electron-Phonon Interaction in Superconducting Nanowire Single-Photon Detectors (SNSPDs)“. Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22296.
Der volle Inhalt der QuelleThis Ph.D. thesis is based on the experimental study of two mutually interconnected phenomena: intrinsic timing jitter in superconducting nanowire single-photon detectors (SNSPDs) and relaxation of the electron energy in superconducting films. Microscopically, a building element of any SNSPD device, a superconducting nanowire on top of a dielectric substrate, represents a complex object for both experimental and theoretical studies. The complexity arises because, in practice, the SNSPD utilizes strongly disordered and ultrathin superconducting films, which acoustically mismatch with the underlying substrate, and implies a non-equilibrium state. This thesis addresses the complexity of the most conventional superconducting material used in SNSPD technology, niobium nitride (NbN), by applying several distinct experimental techniques. As an emerging application of the SNSPD technology, we demonstrate a prototype of the dispersive Raman spectrometer with single-photon sensitivity.
Lavanchy, Nicole. „Le métabolisme énergétique du myocarde isolé de rat : la situation ischémique abordée par la spectroscopie de résonance magnétique nucléaire (RMN)“. Grenoble 1, 1987. http://www.theses.fr/1987GRE10055.
Der volle Inhalt der QuelleMozharov, Sergey. „Developments in photonic systems for Raman spectrometry in microreactors“. Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=14493.
Der volle Inhalt der QuelleOdeneye, Michael Adetunji. „Infrared photodissociation of gas phase ions : single photon and multiphoton events“. Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311414.
Der volle Inhalt der QuelleRoos, Andreas. „Single photon double valence ionization of methyl monohalides“. Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-239195.
Der volle Inhalt der QuelleDet här examensarbetet är baserat på experimentella fotojonisations studier av metyl halider vid en fotonenergi motsvarande He IIβ emissionslinjen. Valenselektronerna i dubbeljonisations processerna för CH3F, CH3Cl och CH3I har studerats under användning av en så-kallad magnetisk flask TOF-PEPECO spektrometer. Resultaten av dessa mätningar visar att mestadels direkt dubbeljonisation processer före- kommer, där elektronerna delar kontinuerligt på energin som friges vid jonisationen. Den dubbla jonisa- tions processen är ytterligare studerad genom att tillämpa en tumregel för dubbeljonisation i molekyler, vilket ger en indikation av hur stort avståndet är mellan de två vakanserna som skapades när molekylerna joniserade. Resultaten från tumregeln visar att avståndet mellan vakanserna kan vara relaterade till bind- ningsavståndet mellan kol-atomen och halogen-atomen, i respektive metyl halogen. För att ytterligare bekräfta dubbeljonisations processerna i dessa molekyler, krävs kvantmekaniska beräkningar.
Ottewell, P. „Inclusive photoproduction of phi mesons by photons of energy 70-170 GeV at the Omega Spectrometer with a ring imaging Cerenkov detector“. Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233386.
Der volle Inhalt der QuelleGabrielyan, Marianna. „RELATIVE ENERGY CALIBRATION OF THE TJNAF HALL-B PHOTON TAGGER AND INVESTIGATION OF LIMITATIONS OF THE PHOTON TAGGING TECHNIQUE“. UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_theses/405.
Der volle Inhalt der QuelleSimpson, Matthew James. „Ion-molecule reaction mass spectrometry and vacuum-ultraviolet negative photoion spectroscopy“. Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1056/.
Der volle Inhalt der QuelleRimal, Dipak. „PROTON FORM FACTOR PUZZLE AND THE CEBAF LARGE ACCEPTANCE SPECTROMETER (CLAS) TWO-PHOTON EXCHANGE EXPERIMENT“. FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1211.
Der volle Inhalt der QuelleBindel, Richard Thomas. „Elliptic flow measured with the PHOBOS spectrometer at RHIC“. College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8546.
Der volle Inhalt der QuelleThesis research directed by: Dept. of Chemistry and Biochemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Simon, Anne-Laure. „Couplage de la spectrométrie de mobilité ionique et de la spectroscopie optique : études conformationnelles en phase gazeuse“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1128/document.
Der volle Inhalt der QuelleThis thesis deals with the development of a new instrument coupling mass spectrometry, ion mobility spectrometry and laser spectroscopy. The aim is to perform structural analysis on biomolecular systems.The first part of this thesis focuses on the construction, the development and the optimization of the set-up. The main point was to determine the features of the set-up (resolution, working frequency) by series of tests with model systems.In a second phase, we did conformer resolved action spectroscopy. We studied the relation between the conformation and the optical properties of one system by measuring photo- electron detachment on different selected conformers. In the framework of action spectroscopy we used the new capacity of the set-up to perform cis-trans photo-isomerization on non-covalent complexes. We showed with this example interest of the use of this instrument to measure photo-isomerization action spectra. We finally showed the possibility to perform conformer resolved action spectroscopy measurements based on Förster Resonance Energy Transfer (FRET) in the gas phase
Niccolai, Silvia. „Three-body Forces in Photoreactions on 3He“. Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Research ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/824932-PJ4Kr6/native/.
Der volle Inhalt der QuellePublished through the Information Bridge: DOE Scientific and Technical Information. "JLAB-PHY-03-39" "DOE/ER/40150-2763" Silvia Niccolai. 02/01/2003. Report is also available in paper and microfiche from NTIS.
Nottingham, Mark. „Resonance photo-ionisation mass spectrometry techniques for the analysis of heavy noble gas isotopes in extra-terrestrial samples“. Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/resonance-photoionisation-mass-spectrometry-techniques-for-the-analysis-of-heavy-noble-gas-isotopes-in-extraterrestrial-samples(93bc14bd-d13f-4d91-ad16-e264754a6e79).html.
Der volle Inhalt der QuelleLangot, Pierre. „Etude femtoseconde de la thermalisation des porteurs libres dans l'arseniure de gallium“. Palaiseau, Ecole polytechnique, 1996. http://www.theses.fr/1996EPXX0021.
Der volle Inhalt der QuelleKosev, Krasimir. „A High-Resolution Time-of-Flight Spectrometer for Fission Fragments and Ion Beams“. Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1224498377426-87820.
Der volle Inhalt der QuelleNarreddula, Venkateswara Reddy. „Development of novel derivatization reagents for analysis of isomeric fatty acids by liquid chromatography-mass spectrometry“. Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/136811/1/Venkateswara%20Reddy_Narreddula_Thesis.pdf.
Der volle Inhalt der QuelleLalande, Mathieu. „Processus induits par l'irradiation de modèles peptidiques de la triple hélice du collagène en phase gazeuse“. Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC235/document.
Der volle Inhalt der QuelleCollagen is the most abundant protein in mammals, and the main constituent of the extracellular matrix of cartilage. The mechanical properties of this tissue are due to the particular triple helical structure of collagen. In this thesis, we focused on peptidic models of the collagen triple helix in thegas phase, which allows reaching their intrinsic properties, including fundamental processes induced by ionizing radiations. An ion mobility spectrometry study of these systems proved that they retain their structural and stability properties in the absence of solvent. In addition, these stability properties also play a role after irradiation with ionizing photons in an ion trap. Furthermore, we have observed, thanks to mass spectrometry, a transition between photo-excitation and photoionization as the energy of the absorbed photon increases in the VUV-X range. Part of this energy is also redistributed in the vibration modes of the system, increases with photon energy, and induces intramolecular as well as intramolecular fragmentation of the triple helix. For the first time, we irradiated peptides in the gas phase by a carbon ion beam having a kinetic energy relevant in the context of hadrontherapy. A process that was absent from studies with photons has been observed : proton detachment. In the last chapter, the validation of a new experimental device dedicated to the irradiation of proteins and DNA strands in a cross-beam configuration, as well as the first results obtained, will be reported
FONTENAY, CHAMPEAUX SANDRINE. „Etude d'un spectrometre gamma a effet compton pour hauts flux de photons dans la gamme d'energie 0,5-12 mev“. Paris 11, 1995. http://www.theses.fr/1995PA112054.
Der volle Inhalt der QuelleMayer, Paul Michael. „Photon emissions from ion beam-target gas collisions in a mass spectrometer and the thermochemistry of organic free radicals and cations“. Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/10414.
Der volle Inhalt der QuelleJelínek, Martin. „Analýza neutronového pole laboratorního AmBe zdroje s využitím měřícího stendu“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316943.
Der volle Inhalt der QuelleNouvel, Guy. „Etude par spectrometrie raman des phonons et des excitations electroniques dans les trichalcogenures d'uranium“. Toulouse 3, 1987. http://www.theses.fr/1987TOU30056.
Der volle Inhalt der QuelleKosev, Krasimir. „A High-Resolution Time-of-Flight Spectrometer for Fission Fragments and Ion Beams“. Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A23920.
Der volle Inhalt der QuelleXia, Zhixuan. „Highly sensitive, multiplexed integrated photonic structures for lab-on-a-chip sensing“. Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54848.
Der volle Inhalt der QuelleSioud, Salim. „Improvement of the detection of organic environmental pollutants and comprehension of the gas-phase chemical ionization mechanism using dopant-aided vacuum ultraviolet photoionization high- resolution mass spectrometry“. Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS527.
Der volle Inhalt der QuelleInnovative analytical methods are needed to monitor these organic pollutants in response to climate change. High-resolution mass spectrometry coupled with atmospheric pressure photoionization (APPI-HRMS) associated with ultra-performance liquid chromatography (UHPLC) is a state-of-the-art tool for the analysis of non-polar aromatic molecules. Indeed, multicomponent mixtures and new dopant delivery system (piezoelectric printhead) have been developed for APPI applications to improve the ionization and detection performance of PAHs during atmospheric pressure photoionization mass spectrometry. This allowed us to separate and detect 14 of the 18 studied PAHs at low pg/µl concentrations with high mass accuracies of ≤4 ppm in 5 minutes. In addition, these innovations improved the limits of detection and quantification (LOD and LOQ) of the PAHs tested by 2 to 10 times. Secondly, in order to understand the detailed ionization mechanisms leading to the formation of radical cations ([M]+•), and to the formation of [M–H]+ ions for a class of derivatives of TPD- N-substituted, multiple experimental studies have been investigated. Thus, only one radical cation type, [M]+•, was observed for PAHs using ethanol-based multicomponent dopants. On the other hand, [M–H]+ ions for N-alkyl-TPD derivatives were observed in greater abundance under APPI conditions. In addition, the halogenated benzene-type dopant and the length of the alkyl chain (CnH2n+1), with n ≥4, influenced the formation of [M–H]+ ions
Liu, Min. „Radiation-induced processes within DNA in the gas phase“. Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMC292.
Der volle Inhalt der QuelleDNA damage is generally considered to be the most common and most important type of lesions in cells caused by ionizing radiation. While DNA damage caused by ionizing radiation poses serious risks to human health, it also makes radiation therapy a powerful tool for killing cancer cells and saving lives. For these reasons, a great deal of research has focused on radiation-induced processes within DNA. However, most of this work has been carried out in the condensed phase, which cannot remove the influence of the surrounding environment. In order to investigate the consequences of direct interaction of DNA with ionizing radiation at the molecular scale, we have irradiated a self-complementary DNA sequence in the gas phase with synchrotron radiation or ion beams, and analyzed the resulting product ions by mass spectrometry. Thanks to ion mobility spectrometry, we have established that deprotonated double strands of this sequence indeed form a double helix that is stable in an ion trap, if the charge state is higher than 5-. Then, we have investigated the consequences of specific photoabsorption occurring at the DNA oligonucleotide backbone in the gas phase. By monitoring non-dissociative single electron detachment from deprotonated precursors as a function of photon energy around the phosphorus K-edge, we have identified the X-ray spectral signature of selective photoabsorption at the phosphorus atoms located only in the backbone. We also detected abundant nucleobase fragment cations resulting from multiple electron detachment and thus demonstrated the charge, energy and hydrogen transfer from the backbone to the nucleobases. In the final part of the thesis, we present the results of irradiation of the DNA oligonucleotides by carbon ions in the gas phase. We have observed similar non-dissociative single electron detachment and similarly abundant positive fragment ions after carbon ion impact as in the case of irradiation by X-ray photons. More importantly, we have successfully irradiated a helical DNA double strand in the gas phase for the first time. 70% of the resulting ionic products come from non-dissociative single electron detachment, which is much higher than the case of single strands. Therefore, direct ionization of a DNA double helix after interaction with a single carbon ion does not lead to separation of the strands, which has important implications regarding DNA damage, notably in the context of hadrontherapy
Manrique, John Peter Oyardo. „Reconstrução do espectro de fótons de aceleradores lineares clínicos com base na curva de transmissão e no algoritmo de recozimento simulado generalizado“. Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-31012016-151001/.
Der volle Inhalt der QuelleThe spectral distribution of megavoltage X-rays used in radiotherapy departments is a fundamental quantity from which, in principle, all relevant information required for radiotherapy treatments can be determined. The direct measurement is difficult to achieve clinically and analyzing the transmission is a clinically viable indirect method for determining clinical linear accelerators photon spectra. In this method, transmission signals are acquired after the beam passes through different thicknesses of attenuators. The objective of this work was the establishment and application of an indirect method that used a spectral model based on generalized simulated annealing algorithm to determine the spectrum of clinical linear accelerators photons based on the transmission curve. Analysis of the spectra was made by analytical determination of dosimetric quantities and related parameters.
Momeni, Babak. „Design and Implementation of Dispersive Photonic Nanostructures“. Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16186.
Der volle Inhalt der QuelleMacleod, Kenneth Alexander. „Validation and application of a photo-acoustic gas analyser for multiple breath inert gas washout in children“. Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/33295.
Der volle Inhalt der QuelleForysinski, Piotr Wojciech. „A new photoelectron/photoion spectrometer for the characterisation of molecules and clusters using XUV and UV radiation“. Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38189.
Der volle Inhalt der QuelleMichail, Evripidis [Verfasser], und Christoph [Gutachter] Lambert. „Design and Development of a Two-Photon Absorption Induced Fluorescence Spectrometer and the Investigation of Nonlinear Optical Properties of Organic Chromophores / Evripidis Michail ; Gutachter: Christoph Lambert“. Würzburg : Universität Würzburg, 2021. http://d-nb.info/1238018491/34.
Der volle Inhalt der QuelleBadieirostami, Majid. „Design and implementation of ultra-high resolution, large bandwidth, and compact diffuse light spectrometers“. Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26644.
Der volle Inhalt der QuelleCommittee Chair: Adibi, Ali; Committee Member: Bhatti, Pamela; Committee Member: Callen, William; Committee Member: Gaylord, Thomas; Committee Member: Zhou, Hao-Min. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Ignasiak, Marta. „Study of the mechanism of radiation- and photo-induced oxidation of methionine containing peptides“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112098/document.
Der volle Inhalt der QuelleSeveral factors (radiation, metabolism, pollutants) lead to the generation of oxidizing free radicals in living organisms that damage all biomolecules and especially proteins. One of the protein targets is Methionine (Met). Its oxidation causes highly damaging effects, such as Alzheimer’s or prion disease. The aim of this work was to investigate the transient species and the stable products formed after radiolytic and photolytic oxidation of Met-containing peptides. The reaction of hydroxyl radicals (•OH) and 3-carboxybenzophenone triplet state with Met-residue in peptides was investigated for model compounds (Met-dipeptides) and for longer peptides (e.g. Bradykinin). Laser flash photolysis and pulse radiolysis were used to characterize short-lived transient species, while gamma radiolysis and steady-state photolysis were used for quantitative and qualitative characterization of stable products. The structural modifications induced by oxidation have been characterized by the HPLC coupled with mass spectrometry and Infrared Multi Photon Dissociation Spectroscopy (IRMPD, CLIO Free electron laser). The oxidation of investigated Met-containing compounds by •OH or 3CB* led to the formation of S-centered radical cation >S•+ on Met-residue, that were further stabilized by formation of two-centered three-electron bond (S∴Y)+ or underwent the deprotonation reaction yielding the α-(alkylthio)alkyl radicals (α-S). The oxidation of Met-containing dipeptides by •OH radicals yielded the formation of Met sulfoxide (MetSO) as a main product. Undoubtedly, the identification and characterization of MetSO in deoxygenated solutions containing catalase was a milestone in investigation of stable products. However, in some cases, other products were identified. The stable products of photolysis were adducts with 3-carboxybenzophenone moiety, resulting from radical recombination reaction. Another identified product formed during photolysis was 3CB-3CB benzpinacol photoadduct, which has similar structure to the product of BP irradiations. Identified products (MetSO and the photo-adduct) were formed from the α-S via disproportionation or reaction with 3CBH•/3CBH•⁻. The oxidation of Met-Lys-Bradykinin (MKBR) yielded formation of similar photo-adducts via sensitized reaction with the 3CB*. The •OH induced oxidation of MKBR yielded several products, e.g. the sulfoxide and hydroxylated phenylalanine. In addition, other derivatives of benzophenone (oxybenzone (OXB) and sulisobenzone (SB)) were investigated due. They are widely used in commercial sun-protecting products dp to their unique photophysical properties. However the application of sunscreens awakes controversies because some epidemiological studies indicated an increased risk of malignant melanoma for their users. Photo-instability of sunscreen filters would result in reduced protection and may produce reactive free radicals or mutagens. In addition, the reactions of the sunscreens with oxygen free radicals e.g. hydroxyl radicals are likely to arise and they were not yet sufficiently documented. Finally, the radiolytic and photolytic properties of SB and OXB were investigated using femto-and nanosecond laser flash photolysis. Pulse radiolysis studies of the oxidation of those molecules by •OH radicals were performed. The results obtained for SB and OXB were compared to several other benzophenone derivatives. The results shown the formation of excited singlet state that was deactivated efficiently via the Excited State Intramolecular Proton Transfer (ESIPT). In case of polar solvent, the formation of trace amounts phenoxyl radicals was identified, while for nonpolar media those radicals were not observed. The reactivity of UV-excited sun filters towards simple derivatives of Met was also investigated, however, this topic requires further and more detailed investigations
Cavalier, Paul. „Echantillonnage direct de franges lumineuses avec des nanodétecteurs supraconducteurs dans un interféromètre en optique intégrée : application à la conception et la réalisation d'un micro-spectromètre SWIFTS“. Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00622518.
Der volle Inhalt der QuelleBrook, Nicholas H. „The flavour dependence of charged hadron production at large transverse momenta using high energy photon and hadron beams at the OMEGA spectrometer : equipped with a ring imaging Cherenkov detector“. Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328282.
Der volle Inhalt der QuelleEnjalbert, Quentin. „Nouvel outil de quantification de biomarqueurs couplant la spectroscopie optique et de la spectrométrie de masse, la Photo-SRM“. Phd thesis, Université Claude Bernard - Lyon I, 2013. http://tel.archives-ouvertes.fr/tel-01072242.
Der volle Inhalt der QuelleNguema, Agnandji Edwin. „Génération et détection Terahertz : application à la caractérisation de matériaux en couches minces“. Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13796/document.
Der volle Inhalt der QuelleThis work concerns the characterization of thin film materials by terahertz time domain spectroscopy. For this purpose, we elaborated a terahertz setup in which the terahertz emission and terahertz detection are based on the use of femtosecond laser, semiconductors, ultrafast photoswitches or electro-optic crystals. The study of dielectric function of ferroelectrics thin film (barium titanate/-Ba1-xSrxTiO3) with temperature, give the importance of soft phonon mode. Finally, the electromagnetic behavior of conducting polymers based on polyaniline was made, in particular their shelding effectiveness in millimeter and sub-millimeter length
Brunelle, Alain. „Spectrometrie de masse par temps de vol a multi-sonde de desorption-ionisation (photons u. V. Et particules kev et mev). Des atomes aux agregats comme projectiles“. Paris 11, 1990. http://www.theses.fr/1990PA112195.
Der volle Inhalt der QuelleAbdelmouleh, Marwa. „Processus intrinsèques radio-induits dans des complexes non-covalents d'intérêt biologique et pharmaceutique“. Thesis, Normandie, 2020. http://www.theses.fr/2020NORMC219.
Der volle Inhalt der QuelleNon-covalent bonds play a crucial role in many processes involving molecular systems of biological and pharmaceutical interest, in particular in molecular recognition between a ligand and its receptor. However, their response upon ionizing radiation has scarcely been investigated for understanding radio induced processes. In the first part of this thesis, we present results of photo-absorption experiments of non-covalent complexes containing the vancomycin antibiotic, carried out by means of a mass spectrometer coupled to synchrotron beamlines producing photons in the X and VUV energy range. First, we show that the fragmentation of molecular systems after absorption of one VUV photon is partly correlated with the geometrical structure of the complex. In addition, the processes induced strongly depend on the charge state of the vancomycin/receptor complexes (protonated or deprotonated). For the protonated complex, the cleavage of non-covalent bonds is much more probable than for the deprotonated complex, in which the native interactions are conserved in the gas phase. Moreover, the absorption of one X-Ray photon by vancomycin leads to fragments that can be considered as a spectral signature of its post-translational modifications. This signature is robust not only in terms of photon energy but also of the molecular environment of vancomycin. The second part deals with the study of a protonated tri-peptid in the gas phase by mass and ion mobility spectrometry, and more particularly the effects of nano-solvation by the presence of one or more molecules of crown-ether. We are interested in the fragmentation induced by collision with a rare gas, or by electron transfer or capture, and we have shown that crown ether is not always spectator since it can lower the charge state of protonated peptides by abstracting a proton or a protonated molecule from it, and can even change binding site after electron transfer