rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Coupled-channels calculations of excitation and ionization in ion-atom collisions
  name:
    name part: Martir, Magda Hernandez.
    role:
      role term: creator
  name:
    name part: Ford, Lewis A.
    role:
      role term: degree supervisor.
  name:
    name part: Reading, John F.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses.
  origin info:
    place:
      place term: xx
    date issued: 1981
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xi, 173 leaves : illustrations ; 29 cm
  abstract: A numerical method has been used to compute excitation and ionization cross sections for ion-atom collisions. The projectile is treated classically and follows a straight line, constant velocity path (unless indicated otherwise). The wave function that describes the atom is expanded about the target in a truncated Hilbert space. The interaction between the projectile and the target atom is treated as a time dependent perturbation. A unitary time development operator, U, propagates the wave function from a time prior to the collision to a time after the collision in small time steps. Contrary to first-order theories, coupling between states is allowed. This method has been improved so that any number of partial waves can be included in the wave function expansion. This method has been applied to study negatively charged projectiles. Cross sections are obtained for collisions of antiprotons on atomic hydrogen (30 keV-372 keV) and compared with cross sections of protons on atomic hydrogen to explore the Z(,P) dependence. The antiproton-hydrogen results were converted into electron-hydrogen values with E(,e) = E(,P)(m(,e)/m(,P)) (15 eV-200 eV) and compared to experimental values. In addition, classical trajectories were also computed for electrons deflected from a straight line path by screened and unscreened interactions with the target nucleus. Polarization fractions were also computed. The method is then applied to study vacancy production from the L-shell. The partial wave convergence of the cross sections was carefully studied for s through g waves. The effect of using different potentials to describe the unperturbed target atom was also examined, particularly in regards to their effect on the binding energies. A modification of the Hartree-Fock potential is presented that leaves the wave functions and bound state orbital energies unaltered but lowers the continuum orbital energies and brings the binding energies (and ionization cross sections) closer to experiment…
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. in Philosophy Texas A & M University 1981
  note: "Major subject: Physics."
  note: Includes bibliographical references (leaves 162-165).
  subject:
    topic: Collisions (Nuclear physics)
  subject:
    topic: Heavy ion collisions
  subject:
    topic: Ionization
  subject:
    topic: Physics
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-88366
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-88366
  record info:
    record content source: TXA
    record creation date: 820618
    record change date: 20220104090726.0
    record identifier: in00000069856
    language of cataloging:
      language term: eng