Highly excited states of rubidium (Rb) atoms attached to helium (He) nanodroplets are studied by two-photon ionization spectroscopy in combination with electron and ion imaging. Photoion spectra and angular distributions are in good agreement with a pseudodiatomic model for the RbHe_N complex. Repulsive interactions in the excited states entail fast dissociation followed by ionization of free Rb atoms as well as of RbHe and RbHe_2 exciplexes. Nonresonant excitation generates Rb atoms in low-lying electronic levels by statistical evaporation-like desorption.
@article{arxiv.1109.2298,
title = {Imaging spectroscopy of rubidium atoms attached to helium nanodroplets},
author = {L. Fechner and B. Gruener and A. Sieg and C. Callegari and F. Ancilotto and F. Stienkemeier and M. Mudrich},
journal= {arXiv preprint arXiv:1109.2298},
year = {2017}
}