Phonon dispersion measurements and first-principles calculations for the Au(110) surface

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Abstract
We have measured the dispersion of surface phonons on the (1×2) reconstructed Au(110) surface along the high-symmetry directions using momentum resolved electron-energy-loss spectroscopy. The frequencies of surface modes at high-symmetry points of the surface Brillouin zone have been calculated with force constants determined from first-principles self-consistent total-energy calculations and are in excellent agreement with the experimental data. ‘‘Glue-model’’ calculations which predicted an experimentally not observed dipole active mode peeling off the top of the bulk phonon band seem to overestimate the bonding strength of atoms near the surface.