Tracing charge transfer in argon dimers by XUV-pump IR-probe experiments at FLASH

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Charge transfer (CT) at avoided crossings of excited ionized states of argon dimers is observed using a two-color pump-probe experiment at the free-electron laser in Hamburg (FLASH). The process is initiated by the absorption of three 27-eV-photons from the pump pulse, which leads to the population of Ar2+*-Ar states. Due to nonadiabatic coupling between these one-site doubly ionized states and two-site doubly ionized states of the type Ar+*-Ar+, CT can take place leading to the population of the latter states. The onset of this process is probed by a delayed infrared (800 nm) laser pulse. The latter ionizes the dimers populating repulsive Ar2+ -Ar+ states, which then undergo a Coulomb explosion. From the delay-dependent yields of the obtained Ar2+ and Ar+ ions, the lifetime of the charge-transfer process is extracted. The obtained experimental value of (531 ± 136) fs agrees well with the theoretical value computed from Landau-Zener probabilities.


  • Georg Schmid
  • Kirsten Schnorr
  • Sven Augustin
  • Severin Meister
  • Hannes Lindenblatt
  • Florian Trost
  • Yifan Liu
  • Tsveta Miteva
  • Mathieu Gisselbrecht
  • Stefan Düsterer
  • Harald Redlin
  • Rolf Treusch
  • Kirill Gokhberg
  • Alexander I. Kuleff
  • Lorenz S. Cederbaum
  • Claus Dieter Schröter
  • Thomas Pfeifer
  • Robert Moshammer
External organisations
  • Max Planck Institute for Nuclear Physics
  • Heidelberg University
  • German Electron Synchrotron (DESY)
  • Sorbonne Université
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Article number084314
JournalJournal of Chemical Physics
Issue number8
Publication statusPublished - 2019 Aug 28
Publication categoryResearch