https://doi.org/10.1140/epjd/e2019-90692-0
Regular Article
Fall-back time for photo-ionized Cs atoms attached to superfluid 4He nanodroplets⋆
1
Laboratoire des Collisions, Agrégats, Réactivité, IRSAMC, UMR 5589, CNRS et Université Paul Sabatier-Toulouse 3, 118 route de Narbonne, 31062 Toulouse Cedex 09, France
2
Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany
3
Departament FQA, Facultat de Fsica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
4
Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
5
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
6
Freiburg Institute of Advanced Studies (FRIAS), University of Freiburg, 79194 Freiburg, Germany
a e-mail: marti@fqa.ub.edu
Received:
19
December
2018
Received in final form:
11
March
2019
Published online:
7
May
2019
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 4He-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.
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019