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Abstract
It is shown that negative ions can be ejected from gas-phase water molecules when bombarded with positive ions at keV energies. Emission of both H− and heavier (O− and OH−) anions is observed. Electronic excitation and ionization processes are shown to play a decisive role in cation-induced anion formation.
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Details
1 Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), 6 Bd Mar. Juin, F-14000 Caen, France
2 Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), H-4001 Debrecen, Hungary
3 Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), 6 Bd Mar. Juin, F-14000 Caen, France; Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 USA