Electron Stimulated O(-) Desorption from O2 Condensed on a Rare-Gas Film: Evidence for an Indirect 'Bounce' Trajectory

Abstract

The electron-stimulated O(-) dissociation of O2 gas is well understood. In the energy range from 4 to 10 eV, O(-) ions are produced by dissociative attachment (DA) via the transient O2(-)(2Pi(u)) state. This same DA process has been identified in electron-stimulated desorption (ESD) or O(-) ions from O2. However, electron-energy-dependence curve of the O(-) yield is quite different from that for gaseous O2. The gas-phase curve rises slowly at the threshold and has a symmetric bell shape, while the condensed-phase curve rises sharply at the threshold and has an asymmetric triangular shape. Furthermore, the threshold energy of the condensed-phase curve depends on the rare-gas substrate. In this note, we offer an explanation for the threshold changes and suggest a trajectory for the O(-) ion desorption via the O2(-)(2 Pi(u)) intermediate state. We shall explain the different energy dependence elsewhere. (aw)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1989
Accession Number
ADA216725

Entities

People

  • David E. Ramaker
  • H. Sambe

Organizations

  • George Washington University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Attachment
  • Desorption
  • Dissociation
  • Electron Energy
  • Electrons
  • Energy
  • Substrates
  • Trajectories

Fields of Study

  • Physics

Readers

  • Molecular Photonics/Laser Physics
  • Quantum Chemistry

Technology Areas

  • Microelectronics