**Real-Time Observation of Interference between Atomic One-Electron and Two-Electron Excitations**
H. Geiseler, H. Rottke, N. Zhavoronkov and W. Sandner,
Phys. Rev. Lett.

**Real-time tracking of two-electron dynamics in the ionization continuum of Xe,**
M. Baggash and H. Rottke,
Phys. Rev. A