Desorption Dynamics of Rb2Molecules Off the Surface of Helium Nanodroplets.
The desorption dynamics of rubidium dimers (Rb2) off the surface of helium nanodroplets induced by laser excitation is studied by employing both nanosecond and femtosecond ion imaging spectroscopy. Similarly to alkali metal atoms, we find that the Rb2desorption process resembles the dissociation of a diatomic molecule. However, both angular and energy distributions of detected Rb2+ions appear to be most crucially determined by the Rb2intramolecular degrees of freedom rather than by those of the Rb2HeNcomplex. The pump-probe dynamics of Rb2+is found to be slower than that of Rb+, pointing at a weaker effective guest-host repulsion for excited molecules than for single atoms.
Physikalisches Institut, Universität Freiburg , 79104 Freiburg, Germany.
A
A
Sieg
Physikalisches Institut, Universität Freiburg , 79104 Freiburg, Germany.
J
J
von Vangerow
Physikalisches Institut, Universität Freiburg , 79104 Freiburg, Germany.
F
F
Stienkemeier
Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
O
O
Dulieu
Physikalisches Institut, Universität Freiburg , 79104 Freiburg, Germany.
M
M
Mudrich