Tesi sul tema "Electrons"
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Hoffrogge, Johannes Philipp. "A surface-electrode quadrupole guide for electrons". Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-155503.
Testo completoPapageorgiou, George. "Counting electrons on helium using a single electron transistor". Thesis, Royal Holloway, University of London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415196.
Testo completoSchäfer-Bung, Boris, e Mathias Nest. "Correlated dynamics of electrons with reduced two-electron density matrices". Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2010/4177/.
Testo completoKrecinic, Faruk [Verfasser]. "Ultrafast electron diffraction and imaging using ionized electrons / Faruk Krecinic". Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1142155447/34.
Testo completoMiller, Nathan A. "Using electron-tunneling refrigerators to cool electrons, membranes, and sensors". Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3315773.
Testo completoHardy, Thomas M. "Superconductivity with strongly correlated electrons and an electron-phonon interaction". Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/34947.
Testo completoSiedlein, Rupert V. "A search for excited electrons in electron-proton collisions at HERA /". The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487854314871133.
Testo completoMoreira, Leandro Malard. "Raman spectroscopy of graphene:: probing phonons, electrons and electron-phonon interactions". Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/ESCZ-7ZFGDY.
Testo completoDesde a identificação de uma ou poucas camadas de grafeno em um substrato em 2004, trabalhos intensivos tem sido feitos para se caracterizar esse novo material. Em particular, a Espectroscopia Raman Ressonante tem sido muito importante para elucidar propriedades físicas e químicas em sistemas de grafeno. A Espectroscopia Raman Ressonante também tem se mostrado como uma ferramenta importante para se estudar fônons, elétrons e interações elétron-fônon em grafeno. Nesta tese, ao usarmos diferentes energias de laser de excitação, nós obtivemos propriedades importantes sobre as estruturas eletrônicas e vibracionais para uma e duas camadas de grafeno. Para uma monocamada de grafeno, nós determinamos a dispersão de fônons perto do ponto de Dirac para o modo óptico transversal no plano (iTO) e para o modo acústico longitudinal no plano (iLA). Comparamos nossos resultados experimentais como cálculos teóricos recentes para a dispersao de fônons nas proximidades do ponto K. Para a bicamada de grafeno, nós obtivemos os parâmetros de estrutura eletrônica do modelo de Slonczewski-Weiss-McClure. Nossos resultados mostram que a bicamada de grafeno possue uma forte assimetria elétron-buraco, que por sua vez é mais forte que no grafite. Em experimentos aplicando uma tensão de porta, variamos o nível de Fermi em uma bicamada de grafeno, o que levou uma quebra de simetria, deixando assim ambos os modos de vibração simétricos (S) e anti-simétricos (AS) ativos em Raman. A dependência da energia e do amortecimento desses modos de fônons com a energia de Fermi é explicada através do acoplamento elétron-buraco intra- ou inter- banca. Nossos resultados experimentais deram suporte às previsões teóricas para interações elétron-fónon em uma bicamada de grafeno.
Ren, Yan-Ru. "Orbital spin-splitting factors for conduction electrons in lead". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25961.
Testo completoScience, Faculty of
Physics and Astronomy, Department of
Graduate
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.
Testo completoGuinea, William Edward. "Polarisation and Alignment Studies in Electron Scattering From Rubidium". Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367197.
Testo completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Physical sciences
Science, Environment, Engineering and Technology
Full Text
PEROSA, GIOVANNI. "Impact of the Electrons Dynamics on the Free-electron Lasers Radiation Coherence". Doctoral thesis, Università degli Studi di Trieste, 2023. https://hdl.handle.net/11368/3041022.
Testo completoModern science advancements rely on the possibility of producing short laser-like coherent pulses in the XUV and in the X-rays wavelength ranges to probe electronic structure in atoms, molecules and solid-state matter. For this reason, light-sources including synchrotrons, inverse Compton scattering, high harmonic generation in gas (HHG) and free electron lasers (FELs) are invaluable tools for research in these fields. In particular, they all have in common the exploitation of the radiating process resulting from electrons’ acceleration under the influence of an electromagnetic field. The aim of this thesis is to explore the impact of electrons’ dynamics on the coherence of FELs seeded by an external laser. In this thesis I demonstrate that electrons’ dynamics plays a major role in the conversion and transformation of light’s features, such as coherence, which can be transmitted to electrons and "inherited" from the re-emitted light. To fulfill this purpose, both the theoretical and the experimental approaches have been used. Most of the models presented, derived or extended in this work are, in fact, supported by experimental evidence. The interplay between electrons and light’s properties is investigated using both classical and quantum dynamics. While the former is routinely adopted to describe the FEL dynamics and collective phenomena in an electron bunch, the latter becomes mandatory to fully achieve a faithful description of the varieties of phenomena that involve the emission of photons. From the classical point of view, a comprehensive analytical model for electron beam longitudinal dynamics is derived by including a new phenomenon, known as intrabeam scattering, and by investigating its effect on the electrons’ distribution. The predictions of this model can be directly compared with both beam and FEL measurements, showing a good agreement with both. From the quantum-dynamical point of view, we start to explore the possibility to answer the following question: "is it possible to introduce quantum features, such as coherence, in any process of harmonic generation from a coherent light pulse?" In order to do so, we focus our attention on the characterization of quantum coherence via photon number distribution and the quantum electrodynamics of an electron in a laser field. The practical aspect of my investigation is threefold: the prediction and characterization of electron beam quality; the optimization of seeded and unseeded FELs performances, that is possible through the mitigation of instabilities originated in the electron bunch; the investigation of unexplored FELs features and configurations that could be exploited for novel experiments. Finally, although the results and discussions are directly applied to the FEL case, some of the theoretical results regarding the coherence can be applied, without loss of generality, to any process of electrons-light interaction.
Le, Duc-Anh. "Electrons in 5f Systems". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-61720.
Testo completoHodgson, Matthew J. P. "Electrons in model nanostructures". Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/15657/.
Testo completoBARUE, CHRISTOPHE. "Etude des electrons chauds dans une source d'ions a resonance cyclotron des electrons". Paris 6, 1992. http://www.theses.fr/1992PA066405.
Testo completoAnbumony, Kasi Lakshman Karthi Lee Soo-Young. "Analysis and correction of three-dimensional proximity effect in binary E-beam nanolithography". Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Theses/ANBUMONY_KASI_19.pdf.
Testo completoFernández, Varea José María. "Interactions of electrons with matter". Doctoral thesis, Universitat de Barcelona, 1992. http://hdl.handle.net/10803/667581.
Testo completoMcDonough, Johnathan. "F electrons in CePbâ†3". Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338253.
Testo completoGreen, D. G. "Positron annihilation on core electrons". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557607.
Testo completoChi, Xinyu. "Electrons in the cosmic radiation". Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6570/.
Testo completoKaube, Benjamin. "Plasmonics : from electrons to devices". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58997.
Testo completoThorn, Penny Anne, e penny thorn@flinders edu au. "Electronic State Excitations in the Water Molecule by Collisions with Low Energy Electrons". Flinders University. Chemistry, Physics and Earth Sciences, 2008. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080714.112505.
Testo completoHoffrogge, Johannes Philipp [Verfasser], e Peter [Akademischer Betreuer] Hommelhoff. "A surface-electrode quadrupole guide for electrons / Johannes Philipp Hoffrogge. Betreuer: Peter Hommelhoff". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1033270865/34.
Testo completoSegall, Darren Eric 1970. "Coarse-graining electronic behavior in condensed matter systems : from electrons to continuum elasticity". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29307.
Testo completoIncludes bibliographical references (leaves 131-137).
In this thesis properties of various condensed matter systems are studied, whose dependency on electronic behavior is incorporated through coarse-grained interactions. Three specific systems are considered. In the first system of study, high momentum, plane wave states of the electronic wave function are coarse-grained, while the low momentum states are fully resolved. Moreover, the coarse-graining procedure incorporates the response of the high momentum states to environmental changes and its couplings to changes in the low momentum states. Within density functional theory this allows the representation of the electronic wave function, when using a plane wave basis, to be computationally feasible without having to make the pseudopotential approximation. This coarse-graining procedure is beneficial for the study of high pressure systems, where the response of the core region is important. With this method we study a number of solid phases of boron and reveal a number of important structural and electronic properties on its high pressure and superconducting phase. The second system of study focuses on a slightly coarser scale, where a theory for the elasticity of nanometer sized objects is developed. This theory provides a powerful way of understanding nanoscale elasticity in terms of local group contributions and acts as a bridge between the atomic and the continuum regimes. This theory properly describes elastic fluctuations on length scales on the order of the decay length of the force constant matrix; allowing for straightforward development of new relations between the bending and stretching properties of nanomechanical resonators, which prove to be much more accurate than the continuum-based relations currently employed in experimental analysis.
(cont.) This theory is then used to link features of the underlining electronic structure to the local elastic response in silicon nanoresonators, emphasizing the importance of electronic structure on the local and overall elastic response. Our final system of study focuses on the longest length scales, the continuum. It is shown that the inclusion of electronic structure is crucial in the study of the role of dislocations on the macroscopic property of slip. This thesis explores the discrepancy between experimental data and theoretical calculations of the lattice resistance in bcc metals. This thesis presents results for the temperature dependence of the Peierls stress and the first ab initio calculation of the zero-temperature Peierls stress which employ periodic boundary conditions. The ab initio value for the Peierls stress is over five times larger than current extrapolations of experimental lattice resistance to zero-temperature. Although it is found that the common techniques for such extrapolation indeed tend to underestimate the zero-temperature limit, in this work it is shown that other mechanisms other than the simple Peierls mechanism are important in controlling the process of low temperature slip.
by Darren Eric Segall.
Ph.D.
Sheka, E. F. "Computational Strategy for Graphene: Insight from Odd Electrons Correlation". Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35023.
Testo completoBao, Yunjuan. "Theoretical study of spin transport in low-dimensional systems". Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40687570.
Testo completoNova, Araujo Miguel Antonio da. "2D Bloch electrons in magnetic fields". Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387617.
Testo completoMasood, Waqas. "Electrons and waves in space plasmas". Thesis, Queen Mary, University of London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436333.
Testo completoGreer, Ruth A. "Scattering of electrons by polyatomic molecules". Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239017.
Testo completoMacarie, Liliana Sandina. "Correlated electrons and high-temperature superconductivity". Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307992.
Testo completoAl-Arab, A. M. H. "Cyclotron resonance lineshape of free electrons". Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381924.
Testo completoWallington, Jonathan Peter. "Effective field theories for correlated electrons". Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297769.
Testo completoDzurak, Andrew Steven. "Ballistic hot-electrons in mesoscopic transistors". Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308185.
Testo completoSlevin, Keith Martin. "Electrons in disorded one dimensional systems". Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47666.
Testo completoSmith, Scott Graeme. "Electrons as probes of chiral materials". Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8580/.
Testo completoSilva, Nelson Canzian da. "UM ESPECTROMETRO \"MINI-ORANGE\" PARA ELECTRONS". Universidade de São Paulo, 1990. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-10042015-155559/.
Testo completoA Mini-Orange spectrometer for electrons was designed and built, using plane permanent magnets and a surface barrier detector. Transmission functions were obtained for various system configurations and for energies between 200-1100 keV. A mathematical model of the system was developed, using the analytical solution for the field of a plane magnet and the numerical integration of the equation of motion of the electrons in the MO magnetic field. The calculated transmission functions were compared to the experimental data, showing a good agreement for low and intermediate energies.
Clark, Paul. "Quantum optics of electrons in graphene". Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/416896/.
Testo completoSiraj-Dine, Sami. "Dynamics of electrons in 2D materials". Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC1039.
Testo completoDuring this thesis, we have proposed theoretical and numerical methods to study the behavior of electrons in periodic materials, with a particular interest for 2D materials, like graphene, and topological insulators. The thesis consists in three parts, organized as follows.The first part provides a mathematically proven and simple algorithm to build localized Wannier functions, with the only requirement that the system has vanishing Chern numbers. Based on an explicit and constructive proof of homotopies for the unitary group, the algorithm is able to build localized Wannier for topological insulators such as the Kane-Mele model. The method is validated by numerical tests for several systems.In the second part, we propose an approximation method for Wannier functions that is adapted to the computation of tight-binding Hamiltonians in non-periodic van der Waals heterostructures, that is, layers of 2D materials stacked on top of each other, bound together by the comparatively weak van der Waals forces. This setting is challenging for the usual computational tools of solid-state physics, which rely on the periodicity of crystals. In this context, a first-order approximation is to consider the Wannier functions computed on each layer independently. We therefore propose an approximation scheme for Wannier functions that allows for an efficient computation of tight-binding matrix coefficients, even in the non-periodic case.The third part is theoretical and devoted to the study of independent electrons in a periodic crystal in their ground state, set in motion by a uniform electric field at some prescribed time. We rigorously define the current per unit volume and study its properties using both linear response and adiabatic theory. Our results provide a unified framework for various phenomena such as the quantification of Hall conductivity of insulators with broken time-reversibility, the ballistic regime of electrons in metals, Bloch oscillations in the long-time response of metals, and the static conductivity of graphene
Scheffler, Marc. "Broadband microwave spectroscopy on correlated electrons". [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11612028.
Testo completoRusz, Ján, Ikuo Nishida, Shunsuke Muto e Kazuyoshi Tatsumi. "Site-specific electronic configurations of Fe 3d states by energy loss by channeled electrons". AIP publishing, 2010. http://hdl.handle.net/2237/20791.
Testo completode, Vries Rowen. "An EGSnrc Monte Carlo investigation of backscattered electrons from internal shielding in clinical electron beams". Thesis, University of Canterbury. Physics and Astronomy, 2014. http://hdl.handle.net/10092/9595.
Testo completoRyll, Henning [Verfasser]. "Direct detection of electrons with the pnCCD for applications in transmission electron microscopy / Henning Ryll". Siegen : Universitätsbibliothek der Universität Siegen, 2018. http://d-nb.info/116044370X/34.
Testo completoBartlett, Philip Lindsay. "Complete numerical solution of electron-hydrogen collisions". Thesis, Bartlett, Philip Lindsay (2005) Complete numerical solution of electron-hydrogen collisions. PhD thesis, Murdoch University, 2005. https://researchrepository.murdoch.edu.au/id/eprint/225/.
Testo completoBartlett, Philip Lindsay. "Complete numerical solution of electron-hydrogen collisions". Bartlett, Philip Lindsay (2005) Complete numerical solution of electron-hydrogen collisions. PhD thesis, Murdoch University, 2005. http://researchrepository.murdoch.edu.au/225/.
Testo completoShackleton, Anthony Edward. "Investigations of the Temkin-Poet model for electron-hydrogen iso-electronic series scattering". Thesis, Shackleton, Anthony Edward (2004) Investigations of the Temkin-Poet model for electron-hydrogen iso-electronic series scattering. PhD thesis, Murdoch University, 2004. https://researchrepository.murdoch.edu.au/id/eprint/303/.
Testo completoShackleton, Anthony Edward. "Investigations of the Temkin-Poet model for electron-hydrogen iso-electronic series scattering". Shackleton, Anthony Edward (2004) Investigations of the Temkin-Poet model for electron-hydrogen iso-electronic series scattering. PhD thesis, Murdoch University, 2004. http://researchrepository.murdoch.edu.au/303/.
Testo completoOlivera, Bernat. "Electronic transport in metals at the atomic scale: capacitance emergent magnetism and f-electrons influence". Doctoral thesis, Universidad de Alicante, 2017. http://hdl.handle.net/10045/73051.
Testo completoLin, Jun. "Radiation-induced alterations in mesoporous silicas : The effect of electronic processes involving ions and electrons". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2022. http://theses.enscm.fr/ENSCM_2022_LIN.pdf.
Testo completoMaterials used in nuclear energy (fuel, packaging matrix, structural materials...) are subject to significant stresses due to the creation of defects that modify their properties. Several studies have shown that interfaces can act as a sink for defects caused by irradiation, which suggests that nanomaterials could have a higher resistance to irradiation than materials with a "micrometric" structure. Simultaneously, mesoporous silica materials have grown in popularity in recent years and are becoming more involved in the domain related to radiation conditioning, such as the prospective use of conditioning for nuclear waste. While research has begun to focus on the behavior of non-porous silica materials when exposed to radiation, no extensive investigations have been conducted on the behavior of mesoporous silica when exposed to radiation, particularly at electronic irradiation regime.This thesis aims to comprehend and explain the radiation-induced changes in mesoporous silicas under electronic regimes. This work quantified the evolution of physical (pore volume, pore diameter and distribution...) and structural (polymerization of the network, creation of defects...) properties of mesoporous silica irradiated with high-energy ion beams with stopping powers ranging from 1 keV/nm to 12 keV/nm, and with electron beams (10 - 300 keV and 0.6 - 2.4 MeV). Post-irradiation characterization methods (X-ray reflectivity, gas adsorption, SAXS, FTIR, etc.) have been used, as well as in-situ pore structure monitoring using electron microscopes. The experimental findings indicated that pore structures were susceptible to a certain degree of irradiation-induced shrinking. In contrast, evidence shows that the silica network itself does not alter much in porous silica compared to non-porous silica. Meanwhile, a 3DTS (3D thermal spike) model has been successfully applied to describe and explain the observed pore contraction behavior in response to ionic irradiation. Additionally, the mechanism of pore contraction under electron irradiation has been delineated according to the domain of incident electron energies. When compared to non-porous silica, this research has demonstrated that the existence of nanoscale pores reduces the accumulation of damage induced by irradiation. In conjunction with this effect, the pore contracts until it completely disappears under the impact of irradiation. This characteristic could, from an applicative point of view, be of interest to practitioners in the context of new methods of treating radioactive effluents, such as through the use of a "separation/conditioning" strategy, or in the context of the self-healing of porous gel layers formed on the surface of vitrified waste packages whose final destination is deep geological disposal
Bao, Yunjuan, e 暴云娟. "Theoretical study of spin transport in low-dimensional systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40687570.
Testo completoColla, Massimiliano. "Experiments with a metastable helium atomic trap /". View thesis entry in Australian Digital Theses Program, 2006. http://thesis.anu.edu.au/public/adt-ANU20060828.104229/index.html.
Testo completo