Abstract
Apart from Fuchs-Kliewer surface phonons, conduction-band surface plasmons and probably intraband single-particle scattering contribute to the electron-energy-loss spectra (primary energy ∼5 eV, resolution <10 meV) measured on clean, UHV-cleaved, n-type GaAs(110) surfaces. Coupling between surface phonons and plasmons derives from frequency shifts which depend on surface carrier concentration.