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Comparative study of vibrations in submonolayer structures of potassium on Pt(111)

AutorRusina, G. G.; Eremeev, S. V.; Borisova, S. D.; Chulkov, Eugene V.
Fecha de publicación2012
EditorInstitute of Physics Publishing
CitaciónJournal of Physics Condensed Matter 24(10): 104003 (2012)
ResumenWe present results of a comparative study of the vibrational spectrum and local density of phonon states in ordered p(2 × 2) and (√3 × √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. © 2012 IOP Publishing Ltd.
URIhttp://hdl.handle.net/10261/50520
DOI10.1088/0953-8984/24/10/104003
Identificadoresdoi: 10.1088/0953-8984/24/10/104003
issn: 0953-8984
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