title: Observation of inner electron ionization from radial rydberg wave packets in two-electron atoms
abstract: We have observed multiphoton ionization of the 5s core electron from a 5snd radial Rydberg wave packet of Sr atoms using a short optical pulse. When the outer nd electron is at its outer turning point the inner 5s electron is removed from the atom, and the outer electron is left in a Sr+ Rydberg state, but when the outer electron is at the inner turning point this does not occur. Analysis of the final Sr+ Rydberg states shows that the two electrons interact as the inner electron leaves, so that the outer electron is not simply projected onto the Sr+ Rydberg states.
authors: Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA.
authors: H
authors: Maeda
authors: W
authors: Li
authors: TF
authors: Gallagher