12 transfers most of the energy to the substrate leaving a rather mildly excited cluster on the surface while there is very little energy transfer to MgO(001) and large intrin- sic excitation of the cluster. Reflection from Ar(001) is achieved at the price of severe surface destruction while MgO remains intact at the danger that the highly excited departing cluster may fragment later on. The detailed energy balance differs in the deposition and reflection regime. In case of deposit, most energy is going to intrinsic cluster excitation and substrate po- larization. In case of reflection, there is, of course, more translational energy left for the cluster and the substrate develops equipartition of kinetic and potential energy re- lated to the remaining small, nearly harmonic, oscilla- tions. This work was supported by the Deutsche Forschungs- gemeinschaft (RE 322/10-1, RO 293/27-2), Fonds der Chemischen Industrie (Germany), a Bessel-Humboldt prize, and a Gay-Lussac prize. 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