Ionization and fragmentation of water clusters by fast highly charged ions
GUILLAUME, L.
Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Institut National des Sciences Appliquées - Rennes [INSA Rennes]
Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Institut National des Sciences Appliquées - Rennes [INSA Rennes]
LEGENDRE, S.
Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Department of Physics and Materials Science
Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Department of Physics and Materials Science
TARISIEN, M.
Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
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Centre de recherche sur les Ions, les MAtériaux et la Photonique [CIMAP - UMR 6252]
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physics B: Atomic, Molecular and Optical Physics. 2009, vol. 42, p. 075101
IOP Publishing
Résumé en anglais
We study the dissociative ionization of water clusters by impact of 12 MeV/u Ni<sup>25+</sup> ions. Cold target recoil ion momentum spectroscopy (COLTRIMS) is used to obtain information about stability, energetics and ...Lire la suite >
We study the dissociative ionization of water clusters by impact of 12 MeV/u Ni<sup>25+</sup> 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 H<sub>9</sub>O<sup>+</sup><sub>4</sub> 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, (H<sub>2</sub>O)<sub><i>n</i></sub><i>H</i><sup>+</sup>, 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.< Réduire
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