Abstract
The low energy vibrations of CO molecules adsorbed on Ni(110) have been studied with high resolution He atom scattering. For coverages below about θ = 0.3 a frustrated translation (T) mode with an energy of 3.9 meV has been measured which is assigned to an on-top site adsorption. For the (2 × 1) saturation structure where the CO molecules occupy tilted bridge sites the T-mode energy amounts instead to 7.5 meV. Although the CO tilting is presumably caused by a COCO repulsion, the T-mode energy exhibits no dispersion with the parallel momentum transfer which would suggest that the (dipole-dipole) repulsion has only a negligible effect on the T-mode vibrations.
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