Abstract

Using the pulsed cluster beam flow reactor technique, the authors have measured the reactivity of aluminum clusters toward several molecules under thermal conditions. For each different molecule they observe that the reactivity exhibits a unique dependence on the number of aluminum atoms in the cluster. The overall reactivity of aluminum clusters toward different molecules is ordered roughly as O/sub 2/ > CH/sub 3/OH > CO > D/sub 2/O > D/sub 2/ > CH/sub 4/ with CH/sub 4/ showing no reaction under these experimental conditions. In addition, they are able to place upper and lower bounds on the ionization thresholds for the smaller aluminum clusters.

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