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Dissertations / Theses on the topic 'Low-energy electron beams'

Author: Grafiati

Published: 23 November 2024

Last updated: 31 July 2025

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1

Wu, Chao. "Precision control of intense electron beams in a low-energy ring." College Park, Md. : University of Maryland, 2009. http://hdl.handle.net/1903/9153.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Electrical and Computer Engineering. 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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2

Wilkie, Peter. "Positron moderation and apparatus for low energy electron and positron spectroscopy." University of Western Australia. School of Physics, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0080.

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Surface-analysis and treatment apparatus have been variously designed, manufactured, developed, and commissioned or re-commissioned, for characterising the surfaces and efficiency of positron moderators based around 3 µm thick polycrystalline-tungsten foil. These include XPS and AES, based around a CLAM2 hemispherical analyser, electron-beam heating, ion bombardment, mass spectroscopy, UHV sample mounting, UHV manipulation, gas-handling lines, and entry-lock apparatus. The CLAM2 electron spectrometer is additionally adapted for operation as a bipolar charged-particle spectrometer. All control

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3

Wilhelm, Patrick Udo [Verfasser], and Andreas [Akademischer Betreuer] Wolf. "First Studies of Low-Energy Electron Cooling of keV Energy Ion Beams at the Electrostatic Cryogenic Storage Ring CSR / Patrick Udo Wilhelm ; Betreuer: Andreas Wolf." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1191758532/34.

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4

Ditto, Jeffrey. "Characterization of the Local Structure and Composition of Low Dimensional Heterostructures and Thin Films." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/20434.

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The observation of graphene’s extraordinary electrical properties has stirred great interest in two dimensional (2D) materials. The rapid pace of discovery for low dimensional materials with exciting properties continue with graphene allotropes, multiple polymorphs of borophene, germanene, and many others. The future of 2D materials goes beyond synthesis and characterization of free standing materials and on to the construction of heterostructures or sophisticated multilayer devices. Knowledge about the resulting local structure and composition of such systems will be key to understanding and

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5

Ikram, M. "Radio-frequency generation of an electron plasma in a Malmberg-Penning trap and its interaction with a stationary or pulsed electron beam." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/233616.

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Experiments and numerical investigations on trapped electron plasmas and traveling electron bunches are discussed. A Thomson backscattering diagnostics set up was installed in the ELTRAP (Electron TRAP) device, a Penning-Malmberg trap operating at the Department of Physics of the University of Milano since 2001. Here, an infrared (IR) laser pulse collides with nanosecond electron bunches with an energy of 1-20 keV traveling through a longitudinal magnetic field in a dynamical regime where space-charge effects play a significant role. The backscattered radiation is optically filtered and detec

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6

Martelli, Lorenzo. "Average Current Enhancement of Laser-Plasma Accelerators for Industrial Applications." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAE012.

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Cette thèse de doctorat s'inscrit dans le cadre d'une collaboration CIFRE entre Thales-MIS et le Laboratoire d'Optique Appliquée (LOA). L'objectif principal est d'améliorer le courant moyen des accélérateurs laser-plasma à faible énergie, notamment dans la gamme de quelques MeV. Cette avancée revêt un intérêt particulier pour les applications à faible énergie telles que la tomographie industrielle par rayons X, ne nécessitant pas de faisceaux d'électrons monoénergétiques.Des expériences ont été menées au moyen du système laser de 60 TW installé dans la Salle Jaune du LOA, capable de générer de

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7

Zhang, Tao. "A low energy electron beam system and its application to lithography." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627249.

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8

Wilstead, N. "Some low energy electron beam interactions with Yâ‚‚Oâ‚ƒ:Eu thin films." Thesis, University of Greenwich, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415391.

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9

Krylov, Vladyslav. "Versatile low-energy electron source at the PHIL accelerator to characterise Micromegas with integrated Timepix CMOS readout and study dE/dx for low energy electrons." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS169/document.

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Dans le cadre de cette thèse, la conception, la construction et la mise en service de la plateforme de test LEETECH ont été réalisées. La performance de LEETECH, y compris le mode de fonctionnement à faible multiplicité a été démontrée. En fournissant des paquets d’électrons avec une énergie ajustable jusqu’à 3.5 MeV, une multiplicité ajustable à partir d’électrons simples et une durée des paquets jusqu’à 20ps, LEETECH prend sa place entre les faisceaux tests de hautes énergies et de coûts élevés d’un part et l’utilisation de sources radioactifs d’autre part. Dans la région, qui correspond à l

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10

Phantkankum, Nuttapong. "Development of a Low Energy Electron Accelerator System for Surface Treatments and Coatings." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1450732635.

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11

Yamaguchi, Masanori, Yohei Yamada, Jun Murase, et al. "Surface modification of DMFC using ultra-low energy electron beam irradiation system with silicon base membrane." IEEE, 2006. http://hdl.handle.net/2237/9545.

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12

Gilbert, Steven Jay. "A new ultra-cold positron beam and applications to low-energy positron scattering and electron-positron plasmas /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9970658.

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13

Ma, King-man Simon. "Structure determination by low energy electron diffraction of GaN films on 6H-SiC(0001) substrate by molecular beam epitaxy." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36537524.

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14

Ma, King-man Simon, and 馬勁民. "Structure determination by low energy electron diffraction of GaN films on 6H-SiC(0001) substrate by molecular beam epitaxy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36537524.

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15

Forker, Roman. "Electronic Coupling Effects and Charge Transfer between Organic Molecules and Metal Surfaces." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-26163.

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We employ a variant of optical absorption spectroscopy, namely in situ differential reflectance spectroscopy (DRS), for an analysis of the structure-properties relations of thin epitaxial organic films. Clear correlations between the spectra and the differently intense coupling to the respective substrates are found. While rather broad and almost structureless spectra are obtained for a quaterrylene (QT) monolayer on Au(111), the spectral shape resembles that of isolated molecules when QT is grown on graphite. We even achieve an efficient electronic decoupling from the subjacent Au(111) by ins

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16

Bogren, Oliver, and Simon Olofsson. "Piezoelektrisk energiskördning för oregelbundna lågfrekventa rörelser." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191140.

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Energiskördning är idag ett växande område och är framstående sett till hållbarhetsaspekterna. Vibrationsbaserad sådan har blivit allt populärare där man kan utnyttja mekanisk energi från olika källor till att generera elektrisk energi. Piezoelektricitet fungerar enligt denna princip och piezoelektrisk energiskördning har varit ett område som fler och fler utnyttjar på grund av dess effektivitet, exempelvis till trådlösa sensornätverk. Ett krav på att piezoelektrisk energiskördning ska fungera optimalt är att vibrationerna sker med en satt frekvens utan större variation, ofta i väldigt höga fr

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17

Petráš, Roman. "Únavová odolnost a mechanizmy únavového poškození v materiálech pro vysoké teploty." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2021. http://www.nusl.cz/ntk/nusl-433631.

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Superaustenitická korozivzdorná ocel typu 22Cr25NiWCoCu určená pro vysokoteplotní aplikace v energetickém průmyslu byla studována za podmínek nízkocyklové únavy při pokojové a zvýšené teplotě. Jednotlivé vzorky byly podrobeny různým zátěžným procedurám, což umožnilo studium materiálové odezvy spolu s mechanismem poškození. Křivky cyklického zpevnění/změkčení, cyklického napětí a Coffin-Mansonovy křivky byly vyhodnoceny. Únavová životnost materiálu byla diskutována s ohledem na uplatňované mechanismy poškození, které se vyvinuly za specifických zátěžných podmínek. Standardní izotermální únavové

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18

Wagner, Christian. "Potential Energy Minimization as the Driving Force for Order and Disorder in Organic Layers." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38242.

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The topic of this work is the structural characterization and theoretical modeling of organic single and heterolayers. The growth of sub-monolayers and monolayers (ML) of the two polycyclic aromatic hydrocarbons quaterrylene (QT) and hexa-peri-hexabenzocoronene (HBC) on Ag(111) and Au(111) was investigated. A transition from a disordered, isotropic phase to an ordered phase with increasing coverage was found. The lattice of the ordered phase turned out to be coverage dependent. The intermolecular potential was modeled including Coulomb and van der Waals interaction by a force-field approach. T

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19

Pradeep, A. V. "Development of a Spin-Polarized Low Energy Electron Diffraction System and Investigation on Spin-Orbit and Exchange Interactions on Ir(100) and Ultrathin Fe(100) Grown on Ir(100)." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3202.

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Spin-polarized electron beam has not yet been produced from an unpolarized electron beam using Stern-Gerlach type spin filter, because of the Lorentz force and Heisenberg uncertainty principle. At present, electron spin detectors and filters work on the basis of spin-dependent scattering of an electron beam from crystal surfaces. Single channel efficiencies of all the spin detectors for electrons are orders of magnitudes lower than the ideal one. Specular reflection type spin-polarized low energy electron diffraction (SPLEED)-spin detectors are having higher single channel efficiencies compare

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20

Pradeep, A. V. "Development of a Spin-Polarized Low Energy Electron Diffraction System and Investigation on Spin-Orbit and Exchange Interactions on Ir(100) and Ultrathin Fe(100) Grown on Ir(100)." Thesis, 2016. http://hdl.handle.net/2005/3202.

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Spin-polarized electron beam has not yet been produced from an unpolarized electron beam using Stern-Gerlach type spin filter, because of the Lorentz force and Heisenberg uncertainty principle. At present, electron spin detectors and filters work on the basis of spin-dependent scattering of an electron beam from crystal surfaces. Single channel efficiencies of all the spin detectors for electrons are orders of magnitudes lower than the ideal one. Specular reflection type spin-polarized low energy electron diffraction (SPLEED)-spin detectors are having higher single channel efficiencies compare

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21

"Selective breaking of C-H bond using low energy hydrogen ion beam for the formation of ultra-thin polymer films." 2001. http://library.cuhk.edu.hk/record=b6073382.

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Xu Xiangdong.<br>"December 2001."<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2001.<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Mode of access: World Wide Web.<br>Abstracts in English and Chinese.

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22

Forker, Roman. "Electronic Coupling Effects and Charge Transfer between Organic Molecules and Metal Surfaces." Doctoral thesis, 2009. https://tud.qucosa.de/id/qucosa%3A24145.

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Abstract:

We employ a variant of optical absorption spectroscopy, namely in situ differential reflectance spectroscopy (DRS), for an analysis of the structure-properties relations of thin epitaxial organic films. Clear correlations between the spectra and the differently intense coupling to the respective substrates are found. While rather broad and almost structureless spectra are obtained for a quaterrylene (QT) monolayer on Au(111), the spectral shape resembles that of isolated molecules when QT is grown on graphite. We even achieve an efficient electronic decoupling from the subjacent Au(111) by ins

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23

Suendorf, Martin. "Investigation of the growth process of thin iron oxide films: Analysis of X-ray Photoemission Spectra by Charge Transfer Multiplet calculations." Doctoral thesis, 2012. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2012121910580.

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Thin metallic films with magnetic properties like magnetite are an interesting material in current technological applications. In the presented work the iron oxide films are grown by molecular beam epitaxy on MgO(001) substrates at temperatures between room temperature and 600K. The film and surface structure are investigated by x-ray reflectometry (XRR), x-ray diffraction (XRD) and low energy electron diffraction (LEED). The chemical properties are investigated by x-ray photoelectron spectroscopy (XPS). Furthermore, charge transfer multiplet (CTM) calculations are performed as a means to gain

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24

Wagner, Christian. "Potential Energy Minimization as the Driving Force for Order and Disorder in Organic Layers." Doctoral thesis, 2009. https://tud.qucosa.de/id/qucosa%3A25311.

Full text

Abstract:

The topic of this work is the structural characterization and theoretical modeling of organic single and heterolayers. The growth of sub-monolayers and monolayers (ML) of the two polycyclic aromatic hydrocarbons quaterrylene (QT) and hexa-peri-hexabenzocoronene (HBC) on Ag(111) and Au(111) was investigated. A transition from a disordered, isotropic phase to an ordered phase with increasing coverage was found. The lattice of the ordered phase turned out to be coverage dependent. The intermolecular potential was modeled including Coulomb and van der Waals interaction by a force-field approach. T

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