Abstract
High resolution (~0.5 meV) He atom time-of-flight spectroscopy was used to measure the surface phonon dispersion curves of a strongly relaxed (~ 6%) open (110) surface. Along the direction (parallel to the rows) the time-of-flight spectra indicate the presence of an unexpected mode with anomalous dispersion. Using a lattice dynamical slab calculation based on a simple force constant model this anomaly can be explained by a considerable softening (30%) of the surface intralayer force constant comparable to the case of the noble metal and platinum (111) surfaces. In the lattice dynamical simulation no stiffening of the force constant between the first and second layers had to be included, despite the 6% inward relaxation and in contrast to the analysis of EELS measurements on Ni(100).
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