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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2015

Anion emission from water molecules colliding with positive ions: Identification of binary and many-body processes

Résumé

It is shown that negative ions are ejected from gas-phase water molecules when bombarded with positive ions at keV energies typical of solar-wind velocities. This finding is relevant for studies of planetary and cometary atmospheres, as well as for radiolysis and radiobiology. Emission of both H- and heavier (O- and OH-) anions, with a larger yield for H-, was observed in 6.6-keV 16O+ + H2O collisions. The experimental setup allowed separate identification of anions formed in collisions with many-body dynamics from those created in hard, binary collisions. Most of the anions are emitted with low kinetic energy due to many-body processes. Model calculations show that both nucleus-nucleus interactions and electronic excitations contribute to the observed large anion emission yield.

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hal-01170758 , version 1 (02-07-2015)

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J.-Y. Chesnel, Z. Juhász, E. Lattouf, J. A. Tanis, B. A. Huber, et al.. Anion emission from water molecules colliding with positive ions: Identification of binary and many-body processes. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2015, 91 (6), pp.060701(R). ⟨10.1103/PhysRevA.91.060701⟩. ⟨hal-01170758⟩
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