Anion emission from H2O molecules colliding with positive O+ ions at keV energies: the role of dissociative excitation
Résumé
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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