Enhanced helium-atom scattering from longitudinal surface phonons in Cu(001)
- 15 August 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 48 (7) , 4917-4920
- https://doi.org/10.1103/physrevb.48.4917
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.Keywords
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