  We explore the formation by Free-Electron-Laser radiation of Ar hollow states
with two or three inner-shell holes. We find that even charged Ar ion states
can be more populated than odd charged Ar ion states. This depends on the pulse
intensity and the number of energetically accessible inner- shell holes. Fully
accounting for fine structure, we demonstrate that one electron spectra bare
the imprints of Ar hollow states with two inner-shell holes. Moreover, we show
how the Auger spectra of these hollow states can be extracted from two-electron
coincidence spectra.
