Abstract
We have measured th dispersion of the surface phonons on the (1 × 2) reconstructed Au(110) surface along the high symmetry directions using momentum resolved electron energy-loss spectroscopy (EELS). The measured frequencies are in excellent agreement with recent calculations of the surface modes using force constants determined from first principles, self-consistent, total energy calculations. ‘Glue’-model calculations which predicted an experimentally unobserved dipole active mode peeling off the top of the bulk phonon band, seem to over-estimate the bonding strength of atoms near the surface.
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