title: Real-time observation of interference between atomic one-electron and two-electron excitations.
abstract: We present results of real-time tracking of atomic two-electron dynamics in an autoionizing transient wave packet in krypton. A coherent superposition of two Fano resonances is excited with a femtosecond extreme-ultraviolet pulse. The evolution of the corresponding wave packet is subsequently probed with a delayed infrared pulse. In our specific case, we get access to the interference between one- and two-electron excitation channels in the launched wave packet, which is superimposed on its decay through autoionization. A simple model is able to account for the observed dynamical evolution of this wave packet.
authors.affiliation: Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Straße 2 A, 12489 Berlin, Germany.
authors.forename: Henning
authors.initials: H
authors.lastname: Geiseler
authors.forename: Horst
authors.initials: H
authors.lastname: Rottke
authors.forename: Nickolai
authors.initials: N
authors.lastname: Zhavoronkov
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Sandner