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Inelastic helium atom scattering from sodium atoms on the Cu(001) surface at 50 K reveals a remarkable 15% increase in the frequency of the frustrated translational vibrations (T-mode) from ω=5.56 to 6.34 meV with increasing coverage from Θ Na =0.008 to 0.125. The coverage dependence and the negligible dispersion of the frequency cannot be explained by the direct dipole-dipole coupling...
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