Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Low energy electrons"”.
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Observations of low energy electrons with the OGO-A satellite.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1966. Ph.D.
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Understanding how low energy electrons control the variability of the Earth's electron radiation belts
… belts are regions of geomagnetically trapped electrons, surrounding the Earth, presenting hazards to operational satellites. On the timeframe of hours, both the energy and particle flux of the radiation belts can change by orders of magnitude. Variations in the high energy relativistic …
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Investigation of the Scattering of Low Energy Electrons from the Surface of Single Crystal Aluminum
Elastic and inelastic low energy electron diffraction (ELEED, ILEED) observations have been made on a clean surface of A1(100). Measurements on the (10) and (11) elastic diffraction beams were made using normally incident electrons in the energy range 30 ≤ E ≤ 170 eV. Peaks in the energy loss …
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The collisional excitation of nitrogen by low energy electrons to the second positive (C3∐u]) transition
… the C 3 n 2nd positive state of N ? in the lowest vibrational energy level by bombarding gaseous" nitrogen with electrons in the energy range 80 to 900 eV. When the nitrogen was bombarded by 250 eV electrons the effective cross section was determined to be (1.72 ± - 17 2 .22) x 10 cm , which …
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Mesure de sections efficaces absolues vibrationnelles pour la collision d’électrons de basse énergie (1-19 eV) avec le tétrahydrofurane (THF) condensé
… interactions probabilities (cross sections) of low-energy electrons with an important biomolecule. The studied molecule is tetrahydrofuran (THF) which is a good model for the DNA backbone constituent deoxyribose. Knowing the important quantity of secondary electrons generated by the radiations …
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The effect of δ [delta] rays on impact parameter resolution in pixel detectors
… on the use of Monte Carlo simulations in high energy physics. An investigation of the accuracy of GEANT3 simulation of low energy electrons is detailed.
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Magnetostatic Modelling and Measurement for Particle Dynamics of a Magnetic Energy Filter
… in a filter designed to selectively filter low-energy electrons from beams produced by electron sources. Two electron source configurations—based on a direct current (DC) 0.5 MeV electron gun and a 3.5 MeV radio frequency (RF) electron gun available at the Canadian Light Source (CLS) test …
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Dosimetric characterization of a miniature x-ray source for biophysics studies
Tritium is a low energy beta emitter that is found in abundance at CANDU nuclear power plants and is a cause of concern since it accounts for roughly thirty three percent of the total occupational exposure of nuclear workers. According to current standards, the radiation weighting factor for all …
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CHARACTERIZATION OF BCl₃, SF₆, and BCl₃/SF₆ PLASMAS USING LANGMUIR PROBE MEASUREMENTS
… plasmas is presented. In this study, energy distribution functions, electron temperatures (and average electron energy) and electron, positive ion, and negative ion densities were determined as a function of process conditions such as RF power, chamber pressure, and SF6 percentage in …
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Comparing water to DNA for simulation of Auger electron direct damage to DNA using Geant4
… interest in targeted tumor therapy using Auger electrons has requires an understand of the radiobological effectiveness of low energy electrons. A chromatin ber was constructed within the Geant4 simulation toolkit down to the molecular level. The Binary Encounter Bethe (BEB) model for electron …
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Relativistic theory of low energy electron diffraction
… relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem …
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Temperature dependence of impurity resonances in cuprate superconductors
… excitation spectrum prevents scattering of low energy electrons. In high temperature superconductors (HTS) an additional gap, the pseudogap, develops well above the superconducting transition temperature Tc. The identity of this pseudogap and its relationship to high temperature …
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The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
… for locally exciting photon emission with low-energy electrons. By combining an optical system to capture emitted photons with a conventional STM a powerful tool is realized. Optical, in addition to the geometrical and electrical, properties of atomic structures may be studied …
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Low energy photon mimic of the tritium beta decay energy spectrum
… biological effects associated with tritium (and low energy electrons in general). However, there are complications regarding the dosimetry of tritium, as well as difficulties in handling and using tritium for the purposes of biophysics experiments. To avoid these difficulties, an experiment has …
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Effects of Nuclear Elastic Scattering and Modifications of Ion-Electron Equilibration Power on Advanced-Fuel Burns
… power included here are (1) depletion of low-energy electrons by Coulomb collisions with the ions, and (2) magnetic field effects on the energy transfer between the ions and the electrons. Both NES and the equilibration modifications affect the flow of power to the plasma ions, which is an …
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Triboemission From Ceramics: Charge Intensity and Energy Distribution Characterizations
… to be initiated and controlled by triboemitted low-energy electrons. This Ph.D. dissertation presents the experimental work carried out at the Virginia Polytechnic Institute and State University for the characterization of charge intensity and energy distribution of charged-particles …
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Low-Energy Electron Impact Fragmentations of the Polycyclic Aromatic Hydrocarbon Anthracene
… the fragmentation processes induced by low-energy electron impact with anthracene. This research is relevant in the study of low-energy electron interactions with molecules in gaseous environments, including potentially in the interstellar medium where secondary electrons may be produced …
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Study of Low Energy Electron-Impact Induced Ionization and Fragmentation of Uracil
The aim of this experiment is to study low energy electron impact induced ionization and fragmentation of uracil. The apparatus consists of a pumped vacuum system with an expansion chamber, a collision chamber and a flight tube. A beam of uracil is generated in the expansion chamber, passes through …
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A STUDY OF LOW ENERGY ELECTRON-MOLECULE AND ION-MOLECULE COLLISIONS USING RYDBERG ATOMS (IONIZATION, ASSOCIATION, ATTACHMENT, OXYGEN, WATER)
Low energy collisions between Rydberg atoms and neutral molecules have been investigated over a wide range of principal quantum numbers n, and for several different neutral targets. The results have been used to validate the free-electron, independent particle model of Rydberg atom collisions. …
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Exploration of Hydrogen Gas Evolution from Radioactive Sludges
… main component of the Magnox sludge. When a high-energy ionising particle interacts with matter, its initial passage leaves a cylindrical track where there will be a high density of ions and radical species created. This process will spawn many secondary electrons with a lower energy than the …
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