Abstract
We demonstrate that surface phonons of clean semiconductor surfaces can be studied by Raman spectroscopy. In this work the vibrational properties of clean InP(110) surfaces are investigated. Two surface phonons of ${A}^{\ensuremath{'}}$ symmetry at 254 and $270{\mathrm{cm}}^{\ensuremath{-}1}$ in the band gap between acoustical and optical bulk branches are observed in agreement with theoretical calculations. Because of their limited resolution previous high-resolution electron-energy-loss spectroscopy experiments found only one surface phonon mode near this energy range. Additionally, three other surface modes at 69, 146, and $347{\mathrm{cm}}^{\ensuremath{-}1}$ are identified by Raman spectroscopy.
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