Doctoral Dissertations

Keywords and Phrases

(e,2e) Ionization Study; Electron Impact Ionization; Electron Scattering; Inert Gases; Heavy Atoms; Molecules; Ionization Differential Cross-section; TDCS; FDCS Calculations

Abstract

"In the last twenty years, significant progress has been made for the theoretical treatment of electron impact ionization (e,2e) of atoms and molecules and, for some cases, very nice agreement between experiment and theory has been achieved. In particular, excellent agreement between theory and experiment and theory has been achieved for ionization of hydrogen and helium. However, agreement between experiment and theory is not nearly as good for ionization of larger atoms and molecules. In the first part of this dissertation, different theoretical approaches will be employed to study the triply differential cross section (TDCS) for low and intermediate energy electron-impact ionization of Neon and Argon for different orbital states. There is a very recent interest in studying ionization of Laser aligned atoms in order to get a better understanding about electron impact ionization of molecules. In the next part of this dissertation, results will be presented for electron-impact ionization of three laser aligned atoms, Mg, Ca, and Na. The comparison between the theory and experiment showed that our three body distorted wave (3DW) model gave excellent agreement with experiment in the scattering plane but very poor agreement perpendicular to the scattering plane. An explanation for this poor agreement out of the scattering plane has been provided by comparing our theoretical results with those of the time depended close coupling (TDCC) model and this explanation is also provided in this dissertation.

Recently, significant attention has been directed towards obtaining a better understanding of electron-impact ionization of molecules which are significantly more challenging than atoms. In the last part of this dissertation, results will be presented for electron-impact ionization of three different molecules (N₂, H₂O, and CH₄ ) which have been studied comprehensively using different theoretical approximations for different types of geometries. The published papers in section two contain a detailed analysis and discussion for each of these topics"--Abstract, page iv.

Advisor(s)

Madison, Don H.

Committee Member(s)

Peacher, Jerry
Schulz, Michael, 1959-
Fischer, Daniel
Gelles, Gregory M.

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

National Science Foundation (U.S.)
Libya. Ministry of Higher Education
Scientific and Technological Research Council of Turkey
BAPK
United States. Department of Energy
University of Manchester

Comments

Financial support of National Science Foundation (U.S.) PHY-1068237, PHY-1505819 and PHY-0757749; Financial support of National Science Foundation (U.S.) Extreme Science and Engineering Discovery Environment TG-MCA075029; Financial support of Scientific and Technological Research Council of Turkey 109T738; Financial support of BAPK12.FENED.05 and BAPK15.HIZ.DES.130; Financial support of United States. Department of Energy DE-AC5206NA25396

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2017

Journal article titles appearing in thesis/dissertation

  • Kinematically complete study of low-energy electron-impact ionization of neon: Internormalized cross sections in 3D kinematics
  • Theoretical and experimental investigation of (e,2e) ionization of argon (3p) in asymmetric kinematics at intermediate energy
  • Experimental and theoretical triple differential cross sections for electron impact ionization of Ar (3p) for equal energy final state electrons
  • Kinematically complete study of low-energy electron-impact ionization of argon: Internormalized cross sections in 3D kinematics
  • Theoretical and experimental (e,2e) study of electron-impact ionization of laser-aligned Mg atoms
  • Erratum: Theoretical and experimental (e,2e) study of electron-impact ionization of laser-aligned Mg atoms
  • Evidence for unnatural parity contributions to electron-impact ionization of laser-aligned atoms
  • Ionization differential cross section measurements for N₂ at low incident energy in coplanar and non-coplanar geometries
  • Electron-impact ionization of H₂O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics
  • Low energy (e,2e) measurements of CH₄ and neon in the perpendicular plane
  • Differential cross section measurements for ionization of N₂ in coplanar geometry

Pagination

xvii, 256 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2017 Sadek Mohamed Fituri Amami, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11211

Electronic OCLC #

1021857505

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