We have studied electron emission from decay of plasmons excited in the int
eractions of slow single charged Ne ions with Al surfaces as a function of
incident energy ranging from 0.7 to 8 keV. Bulk plasmon excitation occurs a
bove a threshold incident energy of similar to1 keV and initially coexists
with potential excitation of surface modes. The excitation of bulk plasmons
in Al is determined by fast electrons traveling inside the solid. (C) 2001
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