Abstract

Calcium oxide clusters were produced by a gas aggregation technique and investigated using time-of-flight mass spectrometry. Depending on the source conditions, either singly or doubly charged clusters dominate the mass spectrum. Singly charged (CaO) n Ca m + (m=0-5) clusters are observed for higher flows of inert carrier gas, whereas primarily doubly charged (CaO) n Ca 2+ (n=3-100) clusters are observed at lower flows. The mass spectral abundance patterns indicate that the clusters have cubic structures resembling pieces of the fcc lattice of solid CaO

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