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Multiphoton ionization of helium is investigated in the superintense fieldregime, with particular emphasis on the role of the electron-electroninteraction in the ionization and stabilization dynamics. To accomplish this,we solve ab initio the time-dependent Schr\"odinger equation with the fullelectron-electron interaction included. By comparing the ionization yieldsobtained from the full calculations with corresponding results of anindependent-electron model, we come to the somewhat counterintuitive conclusionthat the single-particle picture breaks down at superstrong field strengths. Weexplain this finding from the perspective of the so-called Kramers-Hennebergerframe, the reference frame of a free (classical) electron moving in the field.The breakdown is tied to the fact that shake-up and shake-off processes cannotbe properly accounted for in commonly used independent-electron models. Inaddition, we see evidence of a change from the multiphoton to the shake-offionization regime in the energy distributions of the electrons. From theangular distribution it is apparent that correlation is an important factoreven in this regime.

Multiphoton ionization and stabilization of helium in superintense xuv fields