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: First-principles calculations of the response of a material to an intense radiation field
  name:
    name part: Gao, Qingsheng
    name part: 1964-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 1998
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xi, 219 leaves : illustrations ; 28 cm.
  abstract: First principles simulations have been performed for the response of Si to high intensity laser pulses, using a new set of computational techniques. The local density approximation is used to treat exchange and correlation elects. Hellmann-Feynman forces are used to calculate the classical motion of the atoms. The coupled time- dependent Schroedinger equations for electrons and Newtonian equations for atoms are integrated with a fifth order Runge-Kutta method. When the pump intensity is high (4.0 x 1012 [W(f:vt2]), the conduction band minimum descends to about 1.0 eV below the valence band maximum, showing a transformation to metallic behavior. This change is observed to occur about 200 femtoseconds after the pump pulse is applied. The simulations also show that when the pump intensity is relatively low (4.0 x 1011 Wjcn0j no significant change in band structure occurs. The simulations demonstrate that it is the displacement of the ions from their equilibrium positions that causes the band structure to change. These displacements, in tun, are caused by the promotion of electrons from the bonding states in the valence bands to the antibonding states in the conduction bands.
  note: by Qingsheng Gao.
  note: Vita.
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 1998.
  note: Includes bibliographical references: pages 96-98.
  subject:
    topic: Major physics
  identifier: 99-03116 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 990408
    record change date: 20190325093421.0
    record identifier: in00001479229