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THE ENERGY AND ANGULAR DISTRIBUTIONS OF LOW-ENERGYHe+SCATTERED FROM Al(111)

Author

Listed:
  • R. BASTASZ

    (Sandia National Laboratories, Livermore, California 94551-0969, USA)

  • J. A. WHALEY

    (Sandia National Laboratories, Livermore, California 94551-0969, USA)

  • W. P. ELLIS

    (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA)

Abstract

Measurements of500eV4He+scattered from Al(111) surfaces provide detailed information about the scattering process and surface crystallography. We report various observations concerning collision inelasticity, multiple scattering, and shadow-cone focusing effects. A large inelastic energy loss of the scatteredHe+is observed, which causes multiple-scattering events at oblique incidence angles to have energies below the elastic single-scattering energy. InelasticHe+scattering from clean, ordered Al(111) shows interesting intensity variations as a function of azimuthal orientation and incidence angle. At a critical incidence angle, where the top edge of a shadow cone intersects a nearest-neighbor Al surface atom, the scattered ion intensity exhibits 60° azimuthal periodicity. At a more glancing angle of incidence, a double-peaked structure appears. The scatteredHe+intensity varies as a function of incidence angle, as expected from classical shadow cone calculations.

Suggested Citation

  • R. Bastasz & J. A. Whaley & W. P. Ellis, 1999. "THE ENERGY AND ANGULAR DISTRIBUTIONS OF LOW-ENERGYHe+SCATTERED FROM Al(111)," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 6(05), pages 605-611.
    • Handle: RePEc:wsi:srlxxx:v:06:y:1999:i:05:n:s0218625x99000561
    DOI: 10.1142/S0218625X99000561
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