We measured relative electron yields of Pt clusters colliding with aluminum and graphite surfaces. The collision energy was varied between 200 eV and 1.1 keV. The relative electron yield gamma depends on the number of atoms N in the cluster and on the collision energy. We found gamma decreasing with size. A nalternation of the yield with N is present for a graphite target at differnet collision energies whereas gamma decreases smoothly for Pt_N~- colliding with an aluminum target. A model, is proposed, which describes the cluster during the impact as a "transient jellium cluster".
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