title: Initial state dependence in multielectron threshold ionization of atoms.
abstract: It is shown that the geometry of multielectron threshold ionization in atoms depends on the initial configuration of bound electrons. The reason for this behavior is found in the stability properties of the classical fixed point of the equations of motion for multiple threshold fragmentation. Specifically for three-electron breakup, apart from the symmetric triangular configuration also a breakup of lower symmetry in the form of a T shape can occur, as we demonstrate by calculating triple photoionization for the lithium ground and first excited states. We predict the electron breakup geometry for threshold fragmentation experiments.
authors: ITS, University of Oregon, Eugene, Oregon 97403-5203, USA.
authors: Agapi
authors: A
authors: Emmanouilidou
authors: Peijie
authors: P
authors: Wang
authors: Jan M
authors: JM
authors: Rost