Inelastic helium atom scattering from sodium atoms on the Cu(0 0 1) surface at 50 K reveals a remarkable 15% increase in the frequency of the frustrated translational vibrations (T-mode) from ℏω = 5.56 to 6.34 meV with increasing coverage from ΘNa = 0.008 to 0.125. The coverage dependence and the negligible dispersion of the frequency cannot be explained by the direct dipole-dipole coupling but are well-understood in terms of the Lau-Kohn effective long-range interaction via intrinsic surfaces states.
Graham, A., Toennies, J., Benedek, G. (2004). Evidence for Long-Range Surface-State Mediated Interactions between Sodium Atoms on Copper (001). SURFACE SCIENCE, 556(1), 143-149 [10.1016/j.susc.2004.03.010].
Evidence for Long-Range Surface-State Mediated Interactions between Sodium Atoms on Copper (001)
Benedek, G
2004
Abstract
Inelastic helium atom scattering from sodium atoms on the Cu(0 0 1) surface at 50 K reveals a remarkable 15% increase in the frequency of the frustrated translational vibrations (T-mode) from ℏω = 5.56 to 6.34 meV with increasing coverage from ΘNa = 0.008 to 0.125. The coverage dependence and the negligible dispersion of the frequency cannot be explained by the direct dipole-dipole coupling but are well-understood in terms of the Lau-Kohn effective long-range interaction via intrinsic surfaces states.
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