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Tesis sobre el tema "Photochemistry"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Bones, David Lawrence. "Liquid Aerosol Photochemistry." Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/1500.

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Aerosols of nitrate solutions were irradiated in the presence of radical scavengers in an attempt to measure the yield of hydroxyl radical in both the aqueous phase and the gas phase. Carbon monoxide, benzoic acid, benzene and cyclohexane were used as scavengers to trap hydroxyl radical. The products from the reaction of these scavengers with hydroxyl radical were analysed with High Performance Liquid Chromatography and mass spectrometry. The radiant flux in the chamber was measured via ferrioxalate actinometry, both with bulk liquid and aerosol droplets. Many quantitative results were obt

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2

Firth, S. "Low temperature photochemistry." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378979.

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3

Rapley, P. A. "Photochemistry of thiophthalimides." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371027.

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4

Niederjohann, Britta. "Photochemistry of small molecules." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972767398.

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5

Karlsson, Daniel. "Photochemistry of Phenyl Halides." Doctoral thesis, Uppsala universitet, Institutionen för fotokemi och molekylärvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8602.

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We have studied fundamental aspects of photo-induced dissociation kinetics and dynamics in several phenyl halides. By combining femtosecond pump-probe measurements with ab initio calculations we are able to account for several observations. In mixed phenyl halides, the dissociation kinetics is found to be dependent on the nature, the number, and the position of the substituents, and also on the excitation wavelength. A surprisingly large reduction in the dissociation time constant, compared to that of bromobenzene (~30 ps), is observed when having two or more fluorine atoms. For example, in br

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6

Haynes, Anthony. "Intermediates in organometallic photochemistry." Thesis, University of Nottingham, 1989. http://eprints.nottingham.ac.uk/27829/.

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CHAPTER 1: A background to the techniques of matrix isolation, liquid xenon solution and flash photolysis with fast IR detection is presented. The application of infrared spectroscopy in structural studies of metal carbonyl compounds is also discussed. Chapter 2: Photolysis of((nu5-C5R5)Pt(CO))2 (R=H, Me) in frozen gas matrices results in production of ((nu5-C5R5)Pt2(mu-CO)). 13CO enrichment and polarised photochemistry show that the photoproduct contains a single symmetrically bridging CO group. Photolysis of (CpNi(mu-CO))2 in frozen gas matrices results in formation of CP2Ni2(CO) with a term

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7

Banks, C. P. "Aspects of polymer photochemistry." Thesis, University of Hertfordshire, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384083.

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8

Sanderson, Jason Terry. "Studies in organic photochemistry." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393200.

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9

McCallum, Terry. "Radical Adventures in Photochemistry." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37825.

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A field in bloom: photoredox catalysis has allowed chemists access to highly reactive intermediates via the photo-mediated excitation of transition metal complexes and organic dyes for the mild generation of free radicals. These complexes and dyes are designed based on Nature’s blueprints of light-harvesting biomolecules that transform solar energy (photons) into chemical energy during photosynthesis. Light-mediated chemical activation is regarded as one of the most sustainable forms of chemical activation being that the energy provided by the sun is considered renewable and largely underutili

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10

Sugita, Akihiro. "Multiphoton spectroscopy and photochemistry." Kyoto University, 2001. http://hdl.handle.net/2433/150656.

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11

Wang, Jing. "Two-photon Induced Photochemistry." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195094.

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Two-photon absorption is the process in which a molecule absorbs two photons simultaneously. The two key advantages of two-photon processes over one-photon processes are the possibility of excitation of materials with high three-dimensional spatial resolution and deep light-penetration into absorbing materials. Based on bond-cleavage reactions activated by photon-induced intramolecular electron transfer, two-photon activatable acid and radical initiators and two-photon removable protecting groups have been successfully designed and synthesized for photopolymerization and three-dimensional micr

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12

Yen, Chun-Wan. "Plasmonic photochemistry on the nanoscale." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41085.

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When nanoparticles are small in size compared to the wavelength of incident light, a localized surface plasmon resonance occurs. For certain noble metals, such as gold and silver, this frequency occurs in the visible or near IR range, and therefore it can be utilized for many important applications. Only silver and gold nanoparticles were utilized in this thesis work, and they were used in application for three separate files: environment, catalysis, and energy.

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13

Bishenden, Elizabeth. "Mode-selective photochemistry of OClO." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28270.pdf.

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14

Smith, Richard S. "Photochemistry of 3,5-dimethoxybenzyl acetate." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0021/MQ57326.pdf.

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15

Desikan, Vasumathi. "Photochemistry of dibenzothiophene-based sulfilimines." [Ames, Iowa : Iowa State University], 2007.

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16

Bruce, James I. "Supramolecular photochemistry of lanthanide complexes." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308689.

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17

Roscini, Claudio. "Reaction Control in Organic Photochemistry." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521102.

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18

Higgins, Christina Mary. "Tropospheric photochemistry of organic nitrates." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627967.

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The research presented in this thesis explores the tropospheric photochemistry of various organic nitrates (RON02). Interest in the atmospheric community has flourished regarding these species due to their potential role in tropospheric oxidation processes. Initially, a brief introduction to the atmosphere is given and followed by a more detailed description of the tropospheric chemistry surrounding the formation and destruction of RON02. Cavity ring-down spectroscopy was employed to determine the N02 quantum yields from the photoexcitation of organonitrates at tropospherically relevant wavele

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19

Cubbage, Kara. "Synthetic photochemistry of tethered maleimides." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547843.

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20

Knox, Christopher James Henry. "The photochemistry of liquid aerosols." Thesis, University of Canterbury. Chemistry, 2002. http://hdl.handle.net/10092/6076.

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The photochemistry of liquid aerosols has been investigated with the aim of using the physical properties of liquid aerosols to enhance the reactivity of photochemical and photocatalytic systems. The properties of aerosols that enhance reactivity are summarised under four headings: the optics of micro droplets, diffusion into small particles, surface and interfacial reactivity, and capillarity effects. A range of systems have been developed for the photochemistry of liquid aerosols. A number of photocatalytic systems have been studied and a significant enhancement in the photolysis of molyb

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21

Thomas, Dawn Ann. "Matrix photochemistry of stratospheric species." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318039.

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22

Costa, Monica Ferreira da. "Mercury photochemistry in natural waters." Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338305.

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23

Gadd, G. E. "Organometallic photochemistry at low temperatures." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304331.

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24

Reeman, Stuart Michael. "Adsorbate photochemistry of small molecules." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318275.

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25

Richards, Andrew Maurice. "Photochemistry of novel aluminium complexes." Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236925.

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26

Smith, Carina Alice. "The atmospheric photochemistry of formaldehyde." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432746.

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27

Ponczek, Milena. "Understanding Atmospheric Mineral Dust Photochemistry." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1190.

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Les minéraux absorbent la lumière proche des UV (comme TiO2, Fe2O3, MgO) présents dans les aérosols minéraux interagissent avec les gaz traces présents dans l'atmosphère et peuvent initier une nouvelle chimie hétérogène photo-induite potentiellement significative et actuellement peu documentée. Cette thèse vise à aborder différentes questions sur la réactivité des poussières minérales vers les composés organiques et évaluer l'impact de ces interactions sur plusieurs aspects des sciences de l'atmosphère. Nous avons étudié expérimentalement l'interaction physico-chimique d'aérosols minéraux, pur

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28

Zhuang, Bo. "Fundamental Processes in Flavoprotein Photochemistry." Thesis, Institut polytechnique de Paris, 2022. https://tel.archives-ouvertes.fr/tel-03789651.

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Les flavines sont des dérivés de la vitamine B2 qui forment un groupe de chromophores très polyvalents présents dans une grande variété d'enzymes et de protéines photoréceptrices. Elles peuvent adopter trois états redox différents avec divers états de protonation, menant à au moins cinq formes physiologiquement pertinentes, avec des spectres d'absorption électronique distincts. Malgré les propriétés photophysiques diverses des cofacteurs flavine, il n'y a que très peu de flavoprotéines naturellement photoréactives. La grande majorité des flavoprotéines remplissent des fonctions physiologiques

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29

Gan, Daqing. "Aqueous photochemistry of 1,4-benzoquinones and their possible role in the photochemistry of natural organic matter." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2180.

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Thesis (Ph. D.)--University of Maryland, College Park, 2005.<br>Thesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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30

Jansen, Lisinka M. G. "Photochemistry and photophysics of azo dyes." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/28271.

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The photodegradation of azo dyes in solution and on cotton has been investigated. This is a major problem, because of the widespread use of this class of dyes to dye cotton. The photochemical pathways leading to photo degradation and the properties of the excited states and photophysical deactivation processes were studied. Many of the commercially used azo dyes are 1-aryl-2-naphthols with one or more azo groups which undergo azo-hydrazone tautomerism.

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31

Cowley, Nicholas John. "The mechanistic photochemistry of 4-hydroxybenzophenone." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20620.pdf.

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32

Leibovitch, Mordechai. "Asymmetric synthesis in solid state photochemistry." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25090.pdf.

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33

Smith, Kenneth Christopher. "Photochemistry of urea/ketone inclusion compounds." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq24919.pdf.

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34

Delaney-Luu, Michelle Marie. "The photochemistry of substituted poly(acrylophenones)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ33362.pdf.

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35

Volkov, Victor Vitorovich. "Bacteriorhodopsin excited state dynamics and photochemistry." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/26308.

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36

Taylor, Tammye L. "UV photochemistry of synthetic model peptides." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/26966.

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37

Iqbal, Azhar. "Towards understanding the photochemistry of tyrosine." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3735/.

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The H-atom detachment driven through the 1πσ* states of biological chromophores containing an X-H bond (where X = N or O) upon UV absorption is ubiquitous in nature. Understanding the role of this dissociative state in the chromophores and their respective amino acids following UV excitation would enable a step change towards establishing a better understanding of the mechanisms of photostability of larger peptides in the gas-phase. The work presented in this thesis focuses on the H-atom elimination of phenol and indole, the chromophores of the amino acids tyrosine and tryptophan, respectively

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38

Rowland, Glenn Anthony. "The photochemistry of sulfuric acid aerosols." Thesis, University of Canterbury. Chemistry, 2001. http://hdl.handle.net/10092/5949.

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We report here the experimental investigation of several photochemical reactions that may occur in concentrated sulfuric acid droplets in the clouds of the planet Venus. It was found that the irradiation of 80-100wt.% sulfuric acid aerosol with 193nm light in the presence of carbon monoxide resulted in the formation of carbon dioxide and either the formation or destruction of sulfur dioxide. The measured quantum yield for carbon dioxide formation is 0.011±0.010. Various instrumental techniques for determining the size and number density of aerosol droplets were utilised in an attempt to gene

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39

Kennedy, Graham Robert Alexander. "Laser photochemistry of jet-cooled molecules." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/621.

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40

Fletcher, S. C. "Polarized photochemistry and binuclear metal carbonyls." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356518.

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41

Lees, Alistair J. "Photophysics and photochemistry of organometallic complexes." Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417484.

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42

Wilkes, J. "Photochemistry of small adsorbates on surfaces." Thesis, University of Huddersfield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286052.

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43

Shields, C. J. "Matrix photochemistry with plane-polarised light." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372121.

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44

Kunanandam, Suren. "Spectroscopy and photochemistry of arylazonaphtol dyes." Thesis, University of York, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423732.

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45

Haddleton, D. M. "Photochemistry of some metal-ethane complexes." Thesis, University of York, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374165.

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46

Birch, D. "The aqueous photochemistry of small peptides." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383637.

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47

Willasey-Wilsey, Sarah Louise. "The photochemistry of unsaturated carbonyl compounds." Thesis, King's College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309739.

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48

Bushby, Lisa Marie. "Photochemistry and photophysics of lanthanide complexes." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/4208/.

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Luminescent lanthanide complexes have proven to be a productive area of research due in essence to their unique emission properties enabling their use in a variety of applications. A major drawback to using lanthanides is their low extinction coefficients, so that the antenna effect is often used to overcome this problem. In this way, the antenna chromophore absorbs incoming radiation and transfers the energy to the ion, leading to indirect excitation of the lanthanide. Understanding this mechanism of energy transfer is of fundamental importance both for the theory of the photophysical process

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49

Mitchell, Lorna J. "Exploiting the photochemistry of the quinones." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32977/.

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This thesis will focus on two main research areas with the aim of developing and exploring the solar photochemical reactivity of quinones. In Chapter One, a review of quinone photochemistry is presented; this includes both cycloaddition reactions and hydrogen abstraction reactions. After a review of the relevant literature, the aims of the research are outlined and placed into context. Chapter Two details the development of a green photo Friedel-Crafts acylation for the preparation of acylated hydroquinones, which serve as versatile precursors for the synthesis of numerous biologically active

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50

Karabaeva, Kanykey E. "Photochemistry of Masked Pyrene-4,5-Dione." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371083757.

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