Abstract
Ag surface plasmon excitation induced by low keV scattering of hydrogen and He ions is reported. Observation of plasmon excitation in this system was possible in the radiative decay–photon emission channel. The intensity of plasmon radiation was observed to increase quadratically with ion energy. Plasmon excitation was observed for both H + and H − incidence. Here it can be due to neutralisation of H + and H − ionised to H +, as well as secondary electron production. In case of He 0 no plasmon excitation was observed. For He + we ascribed plasmon excitation to mainly secondary electron production. For He ++ plasmon excitation was much larger than for He +. It is assigned to neutralisation into He +* as well as secondary electron emission processes.
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