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Multiple-ionization and dissociation dynamics of a rare gas dimer induced by highly charged ion impact

Abstract : Low-energy collision experiments of an argon dimer with Ar(9+) were performed to measure branching ratios and kinetic energy release (KER) distributions for multiply ionized dimers. Two well-separated KER peaks are observed at 3.8 and 5.3 eV for the doubly ionized dimers, and are assigned to direct Coulombic dissociation and radiative electron capture followed by ionic dissociation, respectively. For the dissociation channels Ar(2+) + Ar(+), Ar(3+) + Ar(+) and Ar(2+) + Ar(2+), the KER distributions show a single peak, the positions of which agree well with those expected for Coulombic dissociation. The branching ratio of asymmetric charge sharing, Ar(3+) + Ar(+), is larger than that of symmetric charge sharing, Ar(2+) + Ar(2+). These results represent unambiguous evidence of a strong limitation of charge mobility across the Ar dimer.
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Submitted on : Monday, November 21, 2011 - 2:23:49 PM
Last modification on : Tuesday, February 19, 2019 - 9:58:02 AM

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J. Matsumoto, A. Leredde, X. Fléchard, K. Hayakawa, H. Shiromaru, et al.. Multiple-ionization and dissociation dynamics of a rare gas dimer induced by highly charged ion impact. 15th International Conference on the Physics of Highly Charged Ions, HCI2010, 2010, Shangai, China. pp.014016, ⟨10.1088/0031-8949/2011/T144/014016⟩. ⟨in2p3-00643217⟩

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