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Teses / dissertações sobre o tema "Electrons – Diffraction"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Krecinic, Faruk [Verfasser]. "Ultrafast electron diffraction and imaging using ionized electrons / Faruk Krecinic." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1142155447/34.

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2

Chen, Yixin. "Electron diffraction analysis of amorphous Ge2Sb2Te5." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669987.

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3

Dogbe, John Kofi. "Comparing cluster and slab model geometries from density functional theory calculations of si(100)-2x1 surfaces using low-energy electron diffraction." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3258835.

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4

Menzel, Andreas. "Step dynamics measurements with time-resolved low energy electron diffraction." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/27870.

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5

Chatelain, Robert P. 1982. "RF compression of electron bunches applied to ultrafast electron diffraction." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111943.

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The dynamics of atomic scale structures during structural change can be studied by Ultrafast Electron Diffraction (UED). The time resolution needed to reveal the fastest dynamics is 100 fs. Sub-angstrom structural resolution becomes possible with 1-1000 pC of charge necessary for diffraction pattern analysis during subtle structural changes. This combination of requirements cannot currently be realized due to the space-charge temporal broadening inherent to bunches of electrons of high fluence and short temporal duration. Simulations show that the incorporation of a specially designed Radio-Fr

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6

Erasmus, Nicolas. "The development of an electron gun for performing ultrafast electron diffraction experiments." Thesis, Stellenbosch : Stellenbosch University, 2009. http://hdl.handle.net/10019.1/2560.

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Thesis (MSc (Physics))--Stellenbosch University, 2009.<br>ENGLISH ABSTRACT: This thesis aims to comprehensively discuss ultrafast electron di raction and its role in temporally resolving ultrafast dynamics on the molecular level. Theory on electron pulses and electron pulse propagation will be covered, but the main focus will be on the method, equipment and experimental setup required to generate sub-picosecond electron pulses, which are needed to perform time resolved experiments. The design and construction of an electron gun needed to produce the electron pulses will be shown in detai

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7

Ho, Wing-kin. "The (3x3) reconstruction of SIC(0001) : a low energy electron diffraction study /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19737105.

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8

Kaufmann, Martin. "Electron Diffraction Studies of Unsupported Antimony Clusters." Thesis, University of Canterbury. Physics and Astronomy, 2006. http://hdl.handle.net/10092/1269.

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This thesis contains two main parts: the first part focusses on an electron diffraction study on unsupported antimony (Sb) clusters, while in the second part the design and development of a time-of-flight mass spectrometer (TOFMS) is discussed. Electron diffraction is an ideal tool to study the structure of clusters entrained in a beam. The main advantage of this technique is the ability to study the clusters in situ and in an interaction-free environment. It is therefore not necessary to remove the particles from the vacuum system which would lead to oxidation. Since the particles do not

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9

何永健 and Wing-kin Ho. "The (3x3) reconstruction of SIC(0001): a low energy electron diffraction study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31215300.

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10

Mok, Cheuk-wai. "Comparing electron and positron scattering factors for applications in diffraction and holography /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18716337.

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11

Burgess, William George. "Charge density determination in semiconductors and other materials by electron diffraction." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/275257.

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12

Hu, Hsiu-Lien. "Quantum transport of energetic electrons in ballistic nanostructures." Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1178341.

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The various electronic phenomena of electrons in the quasi-one-dimensional semiconducotor heterostructures have been largely investigated in the past research, due to its importance both on the theoretical understanding and the design of nanodevices. In particular, most research is currently based on the GaAs-AIGaAs material system with a 2-DEG interface. From the study of Hua Wu, following the Bohm's interpretation of quantum mechanics, energetic electrons approximately approach the classical behavior. The goal of this theoretical study is to investigate how the flow of energetic electrons ma

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13

Rohwer, Andrea Berenike. "Introducing organic molecular crystals into ultrafast electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95819.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Organic molecular salts have a wide range of physical properties which can be chemically tailored by minor variations of their substituents. These characteristics include high degrees of anisotropy, electrical conductivity ranging from superconducting to insulating, and structural changes in the crystal lattice during first order phase transitions brought about by minimal changes in temperature, effective pressure, and in some cases even light. Hence, these materials are particularly interesting for the development of molec

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14

CORNIER-QUIQUANDON, MARIANNNE. "Theorie dynamique de la diffraction des electrons rapides par les cristaux et quasicristaux." Paris 6, 1988. http://www.theses.fr/1988PA066167.

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Description de la diffraction des electrons par les solides ordonnes a longue distance. Le formalisme necessite d'exprimer l'hamiltonien de diffraction sur une base discrete d'ondes planes. Le spectre des etats propres de l'hamiltonien de diffraction est dense non uniforme. Les calculs dynamiques peuvent donc etre effectues en echantillonant le spectre par valeurs discretes. Application de la methode a la simulation des images de microscopie electronique en haute resolution sur une phase icosaedrique en utilisant la description 6d de la structure. Interpretation des resultats experimentaux par

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15

Suleiman, Aminat Oyiza. "Structural dynamics of 1T-TiSe2 using femtosecond electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95990.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Trilayered transition metal dichalcogenides such as our sample (1T-TiSe2) have been studied for many years as systems with strong electron-electron and electron-phonon correlations. The main attraction to this family of compound is its potential to exhibit ground state phenomena known as charge density waves whose detailed physical origin has been controversially determined. In this study, we have used an ultrafast femtosecond laser based on a pump-probe technique, namely ultrafast electron diffraction, to investigate thes

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16

Plana, Ruiz Sergi. "Development & Implementation of an Electron Diffraction Approach for Crystal Structure Analysis." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/670887.

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The application of electron diffraction to crystallographically characterize all kinds of materials has experienced new developments that have attracted some attention in recent years. A large number of structural analyses from different compounds have been already carried out with the help of 3D electron diffraction data that were not possible with the available X-ray methods. The use of a transmission electron microscope as an electron nano-diffractometer has proved to be advantageous when diffraction data from single nanocrystals are required, for instance in phase mixtures. In this way, th

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17

Faulkner, Helen Mary Louise. "Studies in phase and inversion problems for dynamical electron diffraction." Connect to thesis, 2003. http://repository.unimelb.edu.au/10187/2880.

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This thesis examines problems in electron diffraction and related areas of theoretical optics. It begins with a study of the phase of a quantum mechanical wave function and the behaviour of phase vortices and vortex cores. Several rules for vortex core evolution are given and simulated vortex trajectories are studied. These simulations show that in electron microscopy at atomic resolution and in other similar situations, vortices occur in the wave functions very frequently. This means any image processing methods which deal with the wave function phase must permit vortices to occur. In this co

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18

Kassier, Gunther Horst. "Ultrafast electron diffraction : source development, diffractometer design and pulse characterisation." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5359.

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Thesis (PhD (Physics))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Ultrafast Electron Diffraction (UED) is a rapidly maturing field which allows investigation of the evolution of atomic arrangement in solids on timescales comparable to the vibrational period of their constituent atoms (~10-13 s). The technique is an amalgamation of conventional high energy electron diffraction methods and pump-probe spectroscopy with femtosecond (1 fs = 10-15 s) laser pulses. Ultrafast pulsed electron sources generally suffer from limitations on the attainable electron number per pulse (bright

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19

Jones, Daniel M. "A convergent beam electron diffraction study of some rare-earth perovskite oxides /." Connect to this title, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0057.

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20

Jones, Daniel M. "A convergent beam electron diffraction study of some rare-earth perovskite oxides." University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0057.

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This work describes detailed convergent beam electron diffraction (CBED) studies of GdAlO3 and LaAlO3 perovskites. CBED patterns tilted away from major zone axes have been found to have high sensitivity to the presence of mirror or glide mirror symmetry. Such patterns confirm to high accuracy that the space group of GdAlO3 is orthorhombic, Pnma. Tilted patterns from this well characterised structure also serve as benchmarks against which similar patterns may be compared. In the case of LaAlO3, tilted patterns enable the space group to be confirmed as rhombohedral R3c, previously claimed to be

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21

Chandril, Sandeep. "In situ structural and compositional analysis using RHEED electrons induced x-rays." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10641.

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Thesis (Ph. D.)--West Virginia University, 2009.<br>Title from document title page. Document formatted into pages; contains ix, 97 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 95-97).

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22

莫卓威 and Cheuk-wai Mok. "Comparing electron and positron scattering factors for applications indiffraction and holography." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31214459.

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23

Rusz, Ján, Shunsuke Muto, and Kazuyoshi Tatsumi. "Energy Loss by Channeled Electrons: A Quantitative Study on Transition Metal Oxides." Cambridge University Press, 2013. http://hdl.handle.net/2237/20834.

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24

Lau, Wai-ping, and 劉偉平. "Minimising the calculation time of the cluster program by choosing theminimum convergent cluster size and the best relaxation factor." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B29760392.

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25

Haeberlé, Olivier. "Etude du rayonnement electromagnetique genere par des electrons relativistes en interaction avec un reseau de diffraction." Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR13238.

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L'effet smith-purcelle a ete largement etudie depuis la prediction de son existence en 1942 et sa premiere confirmation experimentale en 1953. Les modeles theoriques precedemment existants supposent un electron se propageant parallelement a la surface du reseau de diffraction et perpendiculairement aux traits du reseau. Dans le chapitre premier est exposee dans le cadre d'une theorie electromagnetique la description de l'effet smith-purcell pour un electron se propageant parallelement a la surface d'un reseau de diffraction avec un angle arbitraire par rapport aux traits du reseau. Le modele p

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26

Haupt, Kerstin Anna. "Phase transitions in transition metal dichalcogenides studied by femtosecond electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85608.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Low-dimensional materials are known to undergo phase transitions to differently or- dered states, when cooled to lower temperatures. These phases often show a periodic modulation of the charge density (called a charge density wave – CDW) coupled with a periodic perturbation of the crystal lattice (called a periodic lattice distortion – PLD). Although many experiments have been performed and much has been learnt about CDW phases in low-dimensional materials, the reasons for their existence are still not fully understood yet

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27

周紀文 and Kee-man Chow. "[square root of three] x [square root of three] reconstruction of SiC(0001) surface and 2x1 reconstruction of Si(111) cleaved surface: a LEED study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222456.

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28

梁艾芝 and Ai-chi Angela Leung. "Atomic structure studies of holmium on SI(111) surface by low energy electron diffraction Patterson inversion at multiple incident angles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558824.

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29

HENRI, PASCAL. "Rayonnement de transition par un reseau rayonnement electromagnetique emit par des electrons traversant un reseau de diffraction." Université Louis Pasteur (Strasbourg) (1971-2008), 1999. http://www.theses.fr/1999STR13170.

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Le rayonnement de transition est emis lorsqu'un electron traverse la frontiere separant deux milieux de proprietes optiques differentes. Ce phenomene trouva sa description theorique des 1945 et fut largement etudie experimentalement depuis le rayonnement x jusqu'a l'infrarouge. La majorite des travaux jusqu'ici, ont ete consacres au cas du rayonnement de transition emis par une surface plane (otr). Nous proposons d'etudier dans le domaine du visible, le cas ou le miroir plan est remplace par un reseau optique, la periode du reseau etant de l'ordre de la longueur d'onde d'observation. Nous appe

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30

Pancotti, Alexandre. "Propriedades estruturais e eletrônicas de filmes ultra finos de In, Sn e Sb, crescidos sobre Pd (111), estudados por PED e XPS." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277061.

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Orientador: Richard Landers<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-09T10:50:19Z (GMT). No. of bitstreams: 1 Pancotti_Alexandre_M.pdf: 2977317 bytes, checksum: 914d690fda86677fcc9c894c6f408409 (MD5) Previous issue date: 2005<br>Resumo: Nesse trabalho nos propomos a estudar a estrutura eletrônica e geométrica de ligas de superfície à partir de filmes ultra finos, da ordem de monocamada atômica , crescidos por MBE sobre substratos monocristalinos. Os filmes finos foram crescidos in situ e analizados

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31

Leung, Ai-chi Angela. "Atomic structure studies of holmium on SI(111) surface by low energy electron diffraction Patterson inversion at multiple incident angles." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558824.

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32

Py, Christophe. "Construction d'un interféromètre électronique pour l'étude des propriétés émissives de micropointes à effet de champ : diffraction et interférences d'électrons lents." Grenoble 1, 1993. http://www.theses.fr/1993GRE10176.

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La substitution des filaments chauffants par des micropointes a effet de champ comporte des avantages dans plusieurs applications d'electronique: le leti a deja prouve l'interet de ce principe pour les ecrans plats; de nombreuses personnes croient que les micropointes pourraient fournir des sources micro-ondes innovantes. De plus, les proprietes de l'emission permettent d'aller plus loin en envisageant des applications d'optique electronique que n'etaient pas possible avec les filaments chauffants. En vue d'evaluer les potentialites des micropointes fabriquees au leti pour de telles applicatio

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33

Zeybek, Orhan. "Surface studies of magnetic thin films." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367247.

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34

Amara, Mehdi. "Ordres conjugués à l'antiferromagnétisme dans les composés cubiques de terres rares." Habilitation à diriger des recherches, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00968333.

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Les composés cubiques à base de terres rares sont un terrain favorable à l'expression de degrés de liberté alternatifs, liés à la dégénérescence d'orbite et/ou aux instabilités cristallographiques. Du fait du caractère multiaxial de la symétrie cubique, une simple anisotropie à un ion associée à des couplages d'échange isotrope y conduirait à des états d'ordre magnétique de dégénérescence élevée. Celle-ci étant systématiquement levée, on est forcé de mettre en cause des degrés de liberté autres que celui de spin. Cet impératif est confirmé par l'observation dans ces systèmes de transitions mag

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35

Ihee, Hyotcherl Zewail Ahmed H. Zewail Ahmed H. "Ultrafast electron diffraction /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-04072008-112244.

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36

Morishita, Shigeyuki, Jun Yamasaki, Keisuke Nakamura, Takeharu Kato, and Nobuo Tanaka. "Diffractive imaging of the dumbbell structure in silicon by spherical-aberration-corrected electron diffraction." American Institite of Physics, 2008. http://hdl.handle.net/2237/11975.

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37

Lahme, Stefan. "Femtosecond single-electron diffraction." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-178346.

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Die grundlegenden Funktionsprinzipien der Natur zu verstehen, ist seit jeher Antrieb der Naturwissenschaften. Verhalten und Eigenschaften von Festkörpern werden dabei häufig von dynamischen Prozessen auf atomarer Skala (< 10^-10 m) bestimmt, welche typischerweise auf Zeitskalen im Bereich von zehn Femtosekunden (10^-15 s) bis hin zu vielen Picosekunden (10^-12 s) ablaufen. Zeitaufgelöste Elektronenbeugung an kristallinen Festkörpern ermöglicht die direkte Beobachtung solcher Prozesse in Raum und Zeit. Die bislang mit diesem Verfahren erreichte Zeitauflösung von etwa 100 fs eignet sich jedoch n

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38

White, Thomas Ashley. "Structure solution using precession electron diffraction and diffraction tomography." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611748.

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39

Rivera, Felipe. "Solid Phase Crystallization of Vanadium Dioxide Thin Films and Characterization Through Scanning Electron Microscopy." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2233.pdf.

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40

Diehl, Markus. "Diffraction in electron-proton collisions." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/265482.

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Subject of this thesis is diffractive collisions of electrons and protons, i.e. collisions wher~ the proton remains intact or is slightly excited, and loses only a small fraction of its initial energy. Such processes can be described by the exchange of a pomeron, which is well-known from the phenomenology of highenergy hadron scattering but far from being understood in the framework of quantum chromodynamics. We use the simple model of Landshoff and Nachtmann, where the pomeron is approximated by two nonperturbative gluons, to calculate the cross section for diffractive production of a quark-a

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41

Grasset, Fabien. "Propriétés structurales, magnétiques et catalytiques de nouveaux oxydes à base de ruthénium ou de platine à empilements mixtes dérivés de la structure perovskite." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1998. http://tel.archives-ouvertes.fr/tel-00007279.

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Lors de l'étude de la série A3A'RuO6 (membre n = infini de la famille A3n+3A'nBn+3O9+6n) (A = Ca, Sr ; A'=Li, Na), quatre nouvelles phases ont été isolées. La structure, constituée de chaînes [RuA'O6] parallèles à l'axe c, est isotype de Sr4PtO6. Une étude comparative des propriétés magnétiques et des expériences de diffraction neutronique montre que ces phases ne semblent pas supporter de description en terme de système magnétique monodimensionnel. L'investigation du système Ba-Pt-O a permis de mettre en évidence la solution solide Ba12[BaxPt3-x]Pt6O27 (O £ x £ 3) où x représente la proportio

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42

Pancotti, Alexandre. "Determinação estrutural da superfície de óxidos ordenados por difração de fotoelétrons: o caso de CrxOy sobre Pd(111) e SrTiO3(100)." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277013.

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Orientadores: Richard Landers, Abner de Siervo<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-14T22:49:38Z (GMT). No. of bitstreams: 1 Pancotti_Alexandre_D.pdf: 18876572 bytes, checksum: 607e084dcdd143737b311eaaf705dc73 (MD5) Previous issue date: 2009<br>Resumo: Este trabalho apresenta um estudo sobre a estrutura atômica da superfície de dois materiais com potencial para suportar nano partículas metálicas num catalisador modelo, o primeiro, Óxido de Cromo é um suporte usado comercialmente, e o segundo, SrTiO3(

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43

Hyslop, Michael. "Electron diffraction studies of unsupported clusters." Thesis, University of Canterbury. Physics and Astronomy, 2002. http://hdl.handle.net/10092/5563.

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The motivation to study the structure of clusters is the possible observation of unusual structures for small cluster sizes. The presence of such structural size effects is generally associated with the optimization of surface energy in clusters. For metals that have face centred cubic (FCC) structure in the bulk, optimization of the surface energy typically results in icosahedral or decahedral structures being preferred for nanometre sized clusters. The inert gas aggregation (IGA) technique has been used to produce a beam of clusters (diameter ≤10 nm) for structural studies using electron di

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44

Papathomas, Paul Michael. "Developments in gas-phase electron diffraction." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/12760.

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The first molecular scattering observed using the new Edinburgh electron diffraction apparatus is detailed in this thesis. The new apparatus utilises a phosphor screen/CCD detection system rather than the photographic plates more commonly used in electron diffraction studies. The electron beam is provided by a telefocus electron gun. Two molecular target sources have been investigated: a Campargue-type molecular beam and an effusive needle source. Calibration of the apparatus has been attempted using argon gas. Carbon tetrafluoride, CF<SUB>4</SUB>, has been used as a typical gas-phase molecule

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45

Fender, Robert Scott. "Advances in gas-phase electron diffraction." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/14833.

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A new gas-phase electron diffraction apparatus is reported in this thesis. The machine complements the existing electron diffraction set-up at Edinburgh University. The new apparatus utilises an electron counting device consisting of a pair of stacked microchannel plates and a novel, position-sensitive anode counter rather than the photographic plate-rotating sector method more commonly used in electron diffraction studies. The work carried out with this detector is discussed together with results from a simulation program designed to evaluate the operational capabilities of the device under a

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Xu, Junliang. "Ultrafast imaging: laser induced electron diffraction." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13616.

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Doctor of Philosophy<br>Department of Physics<br>Chii-Dong Lin<br>Imaging of molecules has always occupied an essential role in physical, chemical and biological sciences. X-ray and electron diffraction methods routinely achieve sub-angstrom spatial resolutions but are limited to probing dynamical timescales longer than a picosecond. With the advent of femtosecond intense lasers, a new imaging paradigm emerges in last decade based on laser-induced electron diffraction (LIED). It has been placed on a firm foundation by the quantitative rescattering theory, which established that large-angle e

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McMorran, Benjamin James. "Electron Diffraction and Interferometry Using Nanostructures." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194029.

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Here it is demonstrated that nanofabricated structures can be used as electron optical elements in new types of electron interferometers. This enables novel investigations with electrons analogous to experiments in light and atom optics. Far field diffraction from a single nanograting is used to examine the force on a charge moving in close proximity to a surface. Near field diffraction from the nanograting is investigated in a Talbot interferometer. It is found that electron waves form replicas of the grating in free space, and these replicas can be de-magnified using illumination by a conver

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Bernu, Sylvain. "Etude structurale sous pression de BaVS3, un composé quasi-1d à électrons corrélés, et effets des substitutions chimiques." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00647329.

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BaVS3 est un système quasi-unidimensionnel constitué de chaînes de vanadium. C'est aussi un système multi-bandes dans lequel plusieurs types d'électrons coexistent au voisinage du niveau de Fermi (les bandes dz2 et e(t2g)), qui sont fortement corrélés. Ce système s'appuie donc à la fois sur la physiques des systèmes unidimensionnels et sur celle des systèmes à électrons fortement corrélés. La transition métal-isolant de BaVS3, qui fut l'objet de nombreuses études, a récemment été interprété comme s'apparentant à une onde de densité de charge des électrons dz2 : celle-ci s'accompagne d'une quad

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Hayes, Stuart A. "Development of experimental gas electron diffraction technique." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/2581.

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A state-of-the-art gas electron diffraction (GED) apparatus has been reassembled in the school of chemistry at the University of Edinburgh. This combines molecularbeam and telefocus-electron-gun technologies and the alignment of the electron beam produced by the latter has been discussed. A new custom-made CCD detector has also been installed and electron diffraction patterns for a few small molecules have been recorded. In analogy to the rotating sector in a conventional GED apparatus, the new camera contains an optical filter and a procedure for its calibration is outlined and followed step

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Haydon, S. K. "Structure determination using electron diffraction and microscopy." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603876.

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This thesis presents a program of work initiated to implement, assess and test a difference potential methodology of structure refinement using quantitative electron diffraction. The results of a parallel synthetic and structural study of the pentagonal tunnel (PT) structure, tetragonal lead tungsten bronze (lead-TTB), and the unexplored quaternary Pb-Nb-W-O system are also presented. Quaternary Pb-Nb-W-O phases are synthesised via fully oxidised and reduced reaction mechanisms. The phases observed in both experiment types are similar and based on superstructures of basic TTB, formed by the or

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