Fall-back time for photo-ionized Cs atoms attached to superfluid 4 He nanodroplets

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  • François Coppens, Univ Toulouse, Centre National de la Recherche Scientifique (CNRS), PRES Universite de Toulouse, Universite Toulouse III - Paul Sabatier, Universite de Toulouse, IRAP, UPS OMP
  • ,
  • Johannes von Vangerow, Universität Freiburg
  • ,
  • Antonio Leal, Universitat de Barcelona
  • ,
  • Manuel Barranco, Universitat de Barcelona, Univ Toulouse, Centre National de la Recherche Scientifique (CNRS), PRES Universite de Toulouse, Universite Toulouse III - Paul Sabatier, Universite de Toulouse, IRAP, UPS OMP
  • ,
  • Nadine Halberstadt, Univ Toulouse, Centre National de la Recherche Scientifique (CNRS), PRES Universite de Toulouse, Universite Toulouse III - Paul Sabatier, Universite de Toulouse, IRAP, UPS OMP
  • ,
  • Marcel Mudrich
  • Martí Pi, Universitat de Barcelona
  • ,
  • Frank Stienkemeier, University of Freiburg

Abstract: We have studied the dynamic evolution of a Cs atom photo-excited from 6s to 6p and 7s states on a helium droplet using time-dependent 4 He-DFT simulations. Depending on the excited electronic state, the Cs impurity remains on the droplet surface or it is ejected. Upon subsequent photo-ionization of the excited Cs atom the resulting Cs + cation may either be ejected or come back to the droplet, depending on the time delay between photo-excitation and photo-ionization. We have calculated the critical time delay separating these two different behaviors, as well as final ion velocities. These observables will be used for future comparison with planned pump-probe experiments. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number94
JournalEuropean Physical Journal D
Volume73
ISSN1434-6060
DOIs
Publication statusPublished - 1 May 2019

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