Abstract
Spectroscopic signatures of vibrational excitations on initially oxidized Be(0001) are identified by a combination of electron energy loss spectroscopy and density functional calculations. Prominent spectral features are due to vibrations in a Be-O mixing layer. Scanning tunneling microscopy indicates that initial oxidation occurs locally in the form of islands. The acoustic surface plasmon persists on the oxygen-covered surface. Its dispersion has been determined along the $\overline{\ensuremath{\Gamma}}\overline{K}$ direction and is virtually identical to the dispersion of the acoustic surface plasmon of the clean surface.
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