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Ionization and fragmentation of water clusters by fast highly charged ions

Abstract : 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.
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Contributor : Virginie Mas Connect in order to contact the contributor
Submitted on : Tuesday, April 7, 2009 - 11:01:35 AM
Last modification on : Friday, July 1, 2022 - 3:26:47 AM

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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, IOP Publishing, 2009, 42, pp.075101. ⟨10.1088/0953-4075/42/7/075101⟩. ⟨in2p3-00373737⟩



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