dc.contributor.author | Sørngård, Stian Astad | eng |
dc.contributor.author | Askeland, Sigurd | eng |
dc.contributor.author | Nepstad, Raymond | eng |
dc.contributor.author | Førre, Morten | eng |
dc.date.accessioned | 2013-10-09T14:15:48Z | |
dc.date.available | 2013-10-09T14:15:48Z | |
dc.date.issued | 2011 | eng |
dc.Published | Physical Review A 83: 033414 | eng |
dc.identifier.issn | 1094-1622 | en_US |
dc.identifier.issn | 1050-2947 | en_US |
dc.identifier.uri | https://hdl.handle.net/1956/7379 | |
dc.description.abstract | Multiphoton 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.iso | eng | eng |
dc.publisher | American Physical Society | en_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.title | Multiphoton ionization and stabilization of helium in superintense xuv fields | en_US |
dc.type | Peer reviewed | |
dc.type | Journal article | |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright 2011 American Physical Society | en_US |
dc.identifier.doi | https://doi.org/10.1103/physreva.83.033414 | |