Excitation of quasiparticles during grazing-angle ion reflection at Al surfaces

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Abstract
We have studied ion‐induced electron emission during grazing‐angle scattering of 150 keV protons at clean and oxygen‐covered Al surfaces. The angle‐resolved energy distribution of emitted electrons reveals, in the energy range of 0–30 eV, characteristic peaks, which are directly correlated to various electron excitation mechanisms. For clean Al surfaces, these processes include single electron excitation and excitation of electrons by decay of ion‐excited surface and bulk plasmons. At submonolayer oxygen coverages of the Al surfaces, we already find a drastic decrease of the electron emission peak at 6 eV, which is due to the decay of surface plasmons, and an increase of the O(2s2p2p) Auger electron emission peak located at about 5 eV.

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