Comparative study of vibrations in submonolayer structures of potassium on Pt(111) |
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Authors: | Rusina G G Eremeev S V Borisova S D Chulkov E V |
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Institution: | Institute of Strength Physics and Materials Science SB RAS, Prospekt Academicheskii 2/4, Tomsk 634021, Russia. |
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Abstract: | We present results of a comparative study of the vibrational spectrum and local density of phonon states in ordered p(2 x 2) and (√3 x √3)R30° structures formed by potassium atoms on the Pt(111) surface. The calculations were performed with tight-binding interatomic interaction potentials. It was found that the mode associated with vertical displacements of K adatoms has an energy of about 20 meV in both K structures. The strength and energy of this mode slightly decreases with increasing coverage. This result is in good agreement with available experimental data. As in time-resolved second harmonic generation measurements, we observed low frequency modes for both structures considered, which are caused by the interaction of potassium with the second layer of the substrate. |
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