title: Fragmentation pathways of H+(H2O)2 after extreme ultraviolet photoionization.
abstract: Photofragmentation of the protonated water dimer H+(H2O)_{2}, a fundamental system both in aqueous solutions and gas-phase water clusters, has been studied at 13.8 nm using the Free Electron Laser FLASH in Hamburg. In a crossed-beam experiment using time-resolved, single-molecule fragment imaging, the two-body breakup into H2O++H3O+ was found as a prominent fragmentation channel with a kinetic energy release of up to 10 eV. This channel was observed with at least a similar yield as events with stronger fragmentation, producing protons together with neutral fragments and showing an absolute cross section of (0.5 ± 0.2) × 10(-18) cm2.
authors.affiliation: Department of Physics and Astronomy, Aarhus University, 8000 Århus C, Denmark. lutz@phys.au.dk
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authors.lastname: Lammich
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authors.lastname: Domesle
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authors.lastname: Förstel
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authors.lastname: Martins
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authors.lastname: Guerassimova
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authors.lastname: Hergenhahn
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authors.lastname: Pedersen
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