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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2009

Ionization and fragmentation of water clusters by fast highly charged ions

Résumé

We study the dissociative ionization of water clusters by impact of 12 MeV/u Ni25+ ions. Cold target recoil ion momentum spectroscopy (COLTRIMS) is used to obtain information about stability, energetics and charge mobility of the ionized water clusters. An unusual stability of the H9O+4 ion is observed, which could be the signature of the so-called Eigen structure in gas-phase water clusters. From the analysis of coincidences between charged fragments, we conclude that charge mobility is very high and is responsible for the formation of protonated water clusters, (H2O)nH+, that dominate the mass spectrum. These results are supported by Car–Parrinello molecular dynamics and time-dependent density functional theory simulations, which also reveal the mechanisms of such mobility.

Dates et versions

in2p3-00373737 , version 1 (07-04-2009)

Identifiants

Citer

L. Adoui, A. Cassimi, B. Gervais, J.-P. Grandin, L. Guillaume, et al.. Ionization and fragmentation of water clusters by fast highly charged ions. Journal of Physics B: Atomic, Molecular and Optical Physics, 2009, 42, pp.075101. ⟨10.1088/0953-4075/42/7/075101⟩. ⟨in2p3-00373737⟩
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