Novel Features of Potassium and Sodium Vibrations on Copper Surfaces Observed by High-Resolution Electron-Energy-Loss Spectroscopy

Costanza Astaldi, Petra Rudolf, Silvio Modesti

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High-resolution electron-energy-loss spectra of alkali metals adsorbed on Cu show three unexpected features: the adsorbate-substrate stretching frequency does not change with coverage, within 1 meV on Cu(111) and Cu(110), in agreement with the covalent picture of chemisorption; the spectra show an unusual overtone which is interpreted as a consequence of a strongly non linear relationship between the surface dipole moment and the adsorbate-substrate distance; the dynamical dipole moment is strongly coverage dependent.
Original languageEnglish
Number of pages4
JournalSolid State Communications
Issue number11
Publication statusPublished - 1990

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