Enhanced helium-atom scattering from longitudinal surface phonons in Cu(001)

G. Benedek(Max Planck Society), J. Ellis(Max Planck Society), N. S. Luo(Max Planck Society), Andreas M. Reichmuth(Max Planck Society), Paolo Ruggerone(Max Planck Society), J. P. Toennies(Max Planck Society)
Physical review. B, Condensed matter
August 15, 1993
10.1103/physrevb.48.4917
Cited by 65

Abstract

Inelastic helium-atom scattering from Cu(001) shows giant intensities for the longitudinal-surface-phonon resonance. This effect, most pronounced in the 〈100〉 direction and not visible with electron-energy-loss spectroscopy, indicates a very large anisotropic deformability of conduction electrons against the longitudinal modes of surface atoms. Its size and anisotropy are well accounted for by a pseudocharge model for surface dynamics.

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