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Home > Mathematics and Science Textbooks > Physics > Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission from Carbon Foil
Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission from Carbon Foil

Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission from Carbon Foil


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About the Book

This dissertation, "Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission From Carbon Foil" by Bin, Yang, 杨彬, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Secondary electron (SE) emission from thin carbon foils induced by 1-20 keV positrons has been investigated over a range of nominal foil thicknesses from 1.0 to 5.0 μg/cm2. The measurement of SEs was carried out in forward geometry using a microchannel plate as a detector. The SE yield γ has been measured as a function of beam energy and compared with some Monte Carlo simulation results. We also present in this thesis the material parameter Λ=? / (dE / dx) and the emitted SE energy spectra. Forincident positron energy of 5 keV or higher, the distribution is found to be characterizedby the Sickafus form, AEm and m is close to 1. For low energy incident positrons however, another form, Bexp(E / t), is proposed for describing the SE distribution. The maximum scattering angle for SEs emitted from 5.0 μg/cm2 is found to be around 60. Measurements of energy loss and energy loss straggling for 1-10 keV positrons passing through thin carbon foils of different thicknesses ranging from 1.0 to 5.0 μg/cm2 are present in this thesis. The stopping power dE / dx and positron transmission coefficient have also been investigated as a function of incident positron energy and foil thickness. Particularly, our experimental results are compared with those from Monte Carlo simulation and theory with a view to providing a way to determine the real thickness of carbon foil. The ratio of the energy loss straggling to the foil thickness seems to have a linear relation with the beam energy. The transmitted positrons after passing through 5.0 μg/cm2 C-foil have a small scattering angle which is less than 10. Titanium dioxide nanotube arrays fabricated by anodization of titanium foil and annealed at different temperatures were studied using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and positron annihilation spectroscopy (PAS). The crystallization process and morphological change of the nanotubes have been discussed. It is found that anatase (101) only appeared on the walls of the nanotube. The atomic concentration of fluoride and the ratio of Ti/O decreased when the annealing temperature increased. Vacancy type defects were found to diffuse toward the surface when the samples were annealed at 200C and 400C and healing of vacancies occurred at 600C. In addition, the fluoride may form some complexes with vacancies on the surface hence lowering the value of the S parameter. A new design of the lifetime positron beam based on the SE emission is proposed. The observed experimental results and simulation results make it possible to construct a new type of high resolution (DOI: 10.5353/th_b4716028 Subjects: Nanotubes Positron beams Secondary electron emission


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Product Details
  • ISBN-13: 9781361285213
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 188
  • Weight: 730 gr
  • ISBN-10: 1361285214
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 13 mm
  • Width: 216 mm

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Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission from Carbon Foil
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Positron Beam Study of Carbon Foil and Titanium Dioxide Nanotubes, and Proposing a Design of a Lifetime Positron Beam Based on Secondary Electrons Emission from Carbon Foil
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