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@ARTICLE{Vinklarek:645058,
      author       = {Vinklarek, Ivo and Trippel, Sebastian and Belina, Michal
                      and Blum, Luisa and Bromberger, Hubertus and Slavicek, Petr
                      and Küpper, Jochen},
      title        = {{P}roton transfer and hydronium formation in ionized water},
      reportid     = {PUBDB-2026-00564, arXiv:2602.17505},
      year         = {2026},
      note         = {Main manuscript - 4 figures, 8 pages; Supplementary
                      materials - 31 figures, 29 pages},
      abstract     = {Aqueous radiation chemistry emerges through ultrafast
                      proton transfer and ion-radical formation with unexplored
                      energy-redistribution dynamics steering the subsequent
                      reactions. We performed time-resolved disruptive probing on
                      pure water dimer, $\text{(H}_2\text{O)}_2$, to disentangle
                      the post-ionization reactions. Through
                      kinetic-energy-resolved ion imaging, we unraveled the
                      dynamics in the $\text{(H}_2\text{O)}_2^+$ ground state: at
                      low-energy ($\sim$0.05 eV) ultrafast proton transfer
                      ($\sim$19 fs) is followed by
                      $\text{H}_3\text{O}^++\text{OH}$ fragmentation ($\sim$360
                      fs). At higher energies, proton transfer becomes hindered
                      ($\sim$60 fs) while the subsequent fragmentation becomes
                      faster ($\sim$210 fs), evolving into coupled dynamics
                      ($>0.15$ eV, $\sim$100 fs). Moreover, we observed
                      $\text{(H}_2\text{O)}_2^+$ stabilization through a
                      Zundel-like motif. This reveals how ion-radical formation in
                      ionized hydrogen-bonded networks shapes reactivity in
                      aqueous dynamics.},
      cin          = {FS-CFEL-CMI / UNI/EXP / UNI/CUI},
      cid          = {I:(DE-H253)FS-CFEL-CMI-20220405 /
                      $I:(DE-H253)UNI_EXP-20120731$ /
                      $I:(DE-H253)UNI_CUI-20121230$},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / DFG project G:(GEPRIS)390715994 - EXC 2056:
                      CUI: Tiefe Einblicke in Materie (390715994)},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)390715994},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2602.17505},
      howpublished = {arXiv:2602.17505},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2602.17505;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/645058},
}