Doctoral Dissertations

Keywords and Phrases

CDW-EIS (Continuum distorted wave-Eikonal initial state)

Abstract

"The measurement of fully differential cross sections (FDCS) for ion impact has become possible only within the past few years. These fully differential measurements have been made for single ionization of helium by impact of various charged particles. The FDCS experiments for C6+ single ionization of helium have yielded unique ring-shape structures in the-three-dimensional emission pattern of the ionized electron. The theoretical models that have been developed are fully quantum mechanical perturbative calculations. These theoretical models were applied to C6+, Auq+ (q=24 and 53) and proton impact ionization of helium. In the models, the collision is approximated as a three-body process (projectile, ion, ejected electron). For the proton impact, the agreement between the theory and experiment for intermediate-energy (less than 100 keV) proton collisions suggested that a three-body model may not be appropriate for those collision energies (especially, when considering that a proton with energy of 75 keV is equivalent to electron energy of 40 eV, which is only 15 eV above the ionization threshold for helium). These experiments further demonstrate the fact that the fundamental physics governing a simple collision process is still not well understood. Consequently, a complete four-body model was implemented that takes all two-particle Coulomb interactions (six in total) into account on an equal footing"--Abstract, page iv.

Advisor(s)

Peacher, Jerry
Madison, Don H.

Committee Member(s)

Schulz, Michael, 1959-
Parris, Paul Ernest, 1954-
Robertson, D. G. C.

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

National Science Foundation (U.S.)

Comments

Funding from the National Science Foundation under Grant No. PHY 0456528

Publisher

University of Missouri--Rolla

Publication Date

Spring 2006

Journal article titles appearing in thesis/dissertation

  • Probing scattering wave functions close to the nucleus
  • Fully differential cross sections for C6+ single ionization of helium
  • Highly-charged particle impact ionization of He
  • Initial-state correlation effects in low-energy proton impact ionization
  • Precollision and postcollision electron-electron correlation effects for intermediate-energy proton-impact ionization of helium

Pagination

x, 106 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2006 Lewis Matthew Foster, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Electron impact ionizationElectrons -- ScatteringHelium

Thesis Number

T 8988

Print OCLC #

123127847

Electronic OCLC #

956498608

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