Abstract
Using inelastic electron scattering we have mapped the salient surface phonon features of the p(2 × 2)O/Ni(111) system along the \\ ̄ gGP-M̄' direction of the surface Brillouin zone. Because of the diffuse scattering properties of the system, we have developed a maximum entropy deconvolution routine to extract enhanced spectroscopic information from the data. With this routine a set of experimental dispersion curves were successfully obtained for the O/Ni system. We have additionally developed a lattice dynamical model of the system and used spectral density curves from this to produce theoretical dispersion curves for comparison to the experimentally generated curves. From these comparisons we conclude that the bonding interactions in the topmost nickel layers are well described by a scaling relation which relates intermetallic force constants and bond length, and that the various bond lengths present in the surface region can be referenced to a single force constant description of the bulk Ni-Ni interaction. The surface force field derived in this way for p(2 × 2)O/Ni(111) differs significantly from that of the clean Ni(111) interface.
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