Abstract
The adsorption of oxygen and hydrogen (deuterium) on small neutral palladiumclusters was investigated in a cluster beam experiment. The beam passes throughtwo low-pressure reaction cells, and the clusters, with and without adsorbedmolecules, are detected using laser ionization and mass spectrometry. BothH2 andO2 adsorb efficiently on the palladium clusters with only moderate variations with clustersize in the investigated range, i.e. between 8 and 28 atoms. The co-adsorption ofH2 andO2 results in theformation of H2O, detected as a decrease in the number of adsorbed oxygen atoms with an increasing number of collisionswith H2 molecules. A comparison is done with an earlier similar study of clusters of Pt.Furthermore a comparison is done with what is known for sticking and reactivity ofsurfaces.
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