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dc.contributor.authorSørngård, Stian Astadeng
dc.contributor.authorAskeland, Sigurdeng
dc.contributor.authorNepstad, Raymondeng
dc.contributor.authorFørre, Morteneng
dc.date.accessioned2013-10-09T14:15:48Z
dc.date.available2013-10-09T14:15:48Z
dc.date.issued2011eng
dc.PublishedPhysical Review A 83: 033414eng
dc.identifier.issn1094-1622en_US
dc.identifier.issn1050-2947en_US
dc.identifier.urihttps://hdl.handle.net/1956/7379
dc.description.abstractMultiphoton ionization of helium is investigated in the superintense field regime, with particular emphasis on the role of the electron-electron interaction in the ionization and stabilization dynamics. To accomplish this, we solve ab initio the time-dependent Schr¨odinger equation with the full electron-electron interaction included. By comparing the ionization yields obtained from the full calculations with the corresponding results of an independent-electron model, we come to the somewhat counterintuitive conclusion that the single-particle picture breaks down at superstrong field strengths. We explain this finding from the perspective of the so-called Kramers-Henneberger frame, 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 cannot be properly accounted for in commonly used independent-electron models. In addition, we see evidence of a change from the multiphoton to the shake-off ionization regime in the energy distributions of the electrons. From the angular distribution, it is apparent that the correlation is an important factor even in this regime.en_US
dc.language.isoengeng
dc.publisherAmerican Physical Societyen_US
dc.relation.ispartof<a href="http://hdl.handle.net/1956/7378" target="blank">Correlated ionization processes in atoms and molecules</a>en_US
dc.relation.ispartof<a href="http://hdl.handle.net/1956/7053" target="blank">The ionization dynamics of atoms and molecules exposed to short pulses</a>en_US
dc.titleMultiphoton ionization and stabilization of helium in superintense xuv fieldsen_US
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2011 American Physical Societyen_US
dc.identifier.doihttps://doi.org/10.1103/physreva.83.033414


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