Our effort is focused on cluster ions and connecting the properties of small molecules to bulk, especially bulk water. Phenomena of interest at bulk are isolated in clusters for study with incisive gas phase methods. The program is currently focussed on charge transfer interactions for systems associated with water. A new set of experiments examine the dissociation of molecular radicals on a single event basis formed by glancing interactions of mass-selected ions with collision gases. Ion-ion recombination is studied by merging beams of oppositely-charged cluster ions. Much effort is directed at determining the properties of clusters as a function of size, particularly in the nanosize regime.

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