title: Ionization dynamics of helium dimers in fast collisions with He++.
abstract: By employing the cold target recoil ion momentum spectroscopy technique, we have investigated the (He+, He+) breakup of a helium dimer (He2) caused by transfer ionization and double capture in collisions with alpha particles (E = 150  keV/u). Surprisingly, the results show a two-step process as well as a one-step process followed by electron exchange. In addition, interatomic Coulombic decay [L. S. Cederbaum, J. Zobeley, and F. Tarantelli, Phys. Rev. Lett. 79, 4778 (1997).] is observed in an ion collision for the first time.
authors.affiliation: Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str 1, 60438 Frankfurt, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Titze
authors.forename: M S
authors.initials: MS
authors.lastname: Schöffler
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authors.lastname: Kim
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authors.lastname: Trinter
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authors.lastname: Waitz
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authors.lastname: Voigtsberger
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authors.lastname: Neumann
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authors.lastname: Ulrich
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authors.lastname: Kreidi
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authors.lastname: Wallauer
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authors.lastname: Odenweller
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authors.lastname: Havermeier
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authors.lastname: Schössler
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authors.lastname: Meckel
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authors.lastname: Foucar
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authors.lastname: Jahnke
authors.forename: A
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authors.lastname: Czasch
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authors.initials: LP
authors.lastname: Schmidt
authors.forename: O
authors.initials: O
authors.lastname: Jagutzki
authors.forename: R E
authors.initials: RE
authors.lastname: Grisenti
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authors.lastname: Schmidt-Böcking
authors.forename: H J
authors.initials: HJ
authors.lastname: Lüdde
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authors.initials: R
authors.lastname: Dörner