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@ARTICLE{Schnorr:599195,
      author       = {Schnorr, Kirsten and Belina, Michal and Augustin, Sven and
                      Lindenblatt, Hannes and Liu, Yifan and Meister, Severin and
                      Pfeifer, Thomas and Schmid, Georg and Treusch, Rolf and
                      Trost, Florian and Slavicek, Petr and Moshammer, Robert},
      title        = {{D}irect tracking of ultrafast proton transfer in water
                      dimers},
      journal      = {Science advances},
      volume       = {9},
      number       = {28},
      issn         = {2375-2548},
      address      = {Washington, DC [u.a.]},
      publisher    = {Assoc.},
      reportid     = {PUBDB-2023-07219},
      pages        = {eadg7864},
      year         = {2023},
      abstract     = {Upon ionization, water forms a highly acidic radical cation
                      H$_2$O$^+$· that undergoes ultrafast proton transfer
                      (PT)—a pivotal step in water radiation chemistry,
                      initiating the production of reactive H$_3$O$^+$, OH
                      radicals, and a (hydrated) electron. Until recently, the
                      time scales, mechanisms, and state-dependent reactivity of
                      ultrafast PT could not be directly traced. Here, we
                      investigate PT in water dimers using time-resolved ion
                      coincidence spectroscopy applying a free-electron laser. An
                      extreme ultraviolet (XUV) pump photon initiates PT, and only
                      dimers that have undergone PT at the instance of the
                      ionizing XUV probe photon result in distinct H$_3$O$^+$ +
                      OH$^+$ pairs. By tracking the delay-dependent yield and
                      kinetic energy release of these ion pairs, we measure a PT
                      time of (55 ± 20) femtoseconds and image the geometrical
                      rearrangement of the dimer cations during and after PT. Our
                      direct measurement shows good agreement with nonadiabatic
                      dynamics simulations for the initial PT and allows us to
                      benchmark nonadiabatic theory.},
      cin          = {DOOR ; HAS-User / FS-FLASH-O},
      ddc          = {500},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-FLASH-O-20160930},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G2 - FLASH (DESY) (POF4-6G2) / FS-Proposal:
                      F-20150018 (F-20150018)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G2 /
                      G:(DE-H253)F-20150018},
      experiment   = {EXP:(DE-H253)F-FL26-20150901},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {37436977},
      UT           = {WOS:001033220400010},
      doi          = {10.1126/sciadv.adg7864},
      url          = {https://bib-pubdb1.desy.de/record/599195},
}