The recent inelastic Ne scattering data for Ni(111) by Feuerbacher and Willis are theoretically analyzed in the framework of the distorted wave Born approximation. A Ne-surface soft potential model is inferred from two-body Ne-Ni interactions and the many-body effects due to the phonon-induced surface electron charge redistribution are qualitatively described by three-body forces. The surface-projected phonon densities for the Ni(111) surface are calculated from a force constant model including three-body forces. The cut-off produced by the softness of the Ne-Ni potential accounts for the observed cross-over from Rayleigh-wave to bulk phonon scattering regimes. The one-phonon picture correlates well with experiments for outgoing angles slightly apart from the specular condition (Rayleigh-wave regime) whereas for larger deviations from the specular condition (bulk phonon regime) multiphonon contributions are important.

Theory of inelastic Ne scattering from the Ni(111) surface / Bortolani, Virginio; Franchini, Anna; Nizzoli, F.; Santoro, Giorgio; Benedek, G.; Celli, V.. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 128:(1983), pp. 249-264. [10.1016/S0039-6028(83)80030-2]

Theory of inelastic Ne scattering from the Ni(111) surface

BORTOLANI, Virginio;FRANCHINI, Anna;SANTORO, Giorgio;
1983

Abstract

The recent inelastic Ne scattering data for Ni(111) by Feuerbacher and Willis are theoretically analyzed in the framework of the distorted wave Born approximation. A Ne-surface soft potential model is inferred from two-body Ne-Ni interactions and the many-body effects due to the phonon-induced surface electron charge redistribution are qualitatively described by three-body forces. The surface-projected phonon densities for the Ni(111) surface are calculated from a force constant model including three-body forces. The cut-off produced by the softness of the Ne-Ni potential accounts for the observed cross-over from Rayleigh-wave to bulk phonon scattering regimes. The one-phonon picture correlates well with experiments for outgoing angles slightly apart from the specular condition (Rayleigh-wave regime) whereas for larger deviations from the specular condition (bulk phonon regime) multiphonon contributions are important.
128
249
264
Theory of inelastic Ne scattering from the Ni(111) surface / Bortolani, Virginio; Franchini, Anna; Nizzoli, F.; Santoro, Giorgio; Benedek, G.; Celli, V.. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 128:(1983), pp. 249-264. [10.1016/S0039-6028(83)80030-2]
Bortolani, Virginio; Franchini, Anna; Nizzoli, F.; Santoro, Giorgio; Benedek, G.; Celli, V.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/452112
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