The reactivity of nanoscale systems are mainly dominated by quantum-size effects that govern the electronic spectra of clusters, by the structural dynamical fluxionality of clusters, as well as by impurity-doping effects. In this talk these fundamental and unique cluster properties are illustrated by specific examples obtained from expts. on size-selected clusters on surfaces. Where possible, concepts for their understanding are given. In particular, we present a new microcalorimetric expts., where we studied the cluster deposition, as well as the hydrogenation of 1-,3-butadiene on small, deposited Pdn clusters. For this reaction we obtained reaction heats for selected cluster sizes and detd. the adsorption heats for the reactants. In order to obtained more details on the size effects of this reaction we also performed complementary pulsed mol. beam reactive scattering expts. in order to obtain information about the catalytic action. [on SciFinder(R)]     «

The reactivity of nanoscale systems are mainly dominated by quantum-size effects that govern the electronic spectra of clusters, by the structural dynamical fluxionality of clusters, as well as by impurity-doping effects. In this talk these fundamental and unique cluster properties are illustrated by specific examples obtained from expts. on size-selected clusters on surfaces. Where possible, concepts for their understanding are given. In particular, we present a new microcalorimetric expts., wh...     »