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

R. Bastasz, J. A. Whaley and W. P. Ellis
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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

Surface Review and Letters (SRL), 1999, vol. 06, issue 05, 605-611

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.

Date: 1999
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DOI: 10.1142/S0218625X99000561

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