Multistep Ionization of Argon Clusters in Intense Femtosecond Extreme Ultraviolet Pulses
C. Bostedt, H. Thomas, M. Hoener, E. Eremina, T. Fennel, K.-H. Meiwes-Broer, H. Wabnitz, M. Kuhlmann, E. Plönjes, K. Tiedtke, R. Treusch, J. Feldhaus, A. R. B. de Castro and T. Möller
Phys. Rev. Lett. 100, 133401 (2008)

Non-resonant absorption enhancement in laser-excited simple metal clusters through electron-electron collisions
J. Köhn, R. Redmer, K.-H. Meiwes-Broer and T. Fennel
Phys. Rev. A 77, 033202 (2008)