Please use this identifier to cite or link to this item: http://dlib.scu.ac.ir/handle/1956/7379
Title: Multiphoton ionization and stabilization of helium in superintense xuv fields
Publisher: American Physical Society
Description: 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.
Journal Article
publishedVersion
URI: http://localhost:80/handle/1956/7379
More Information: Physical Review A 83: 033414
1050-2947
1094-1622
http://hdl.handle.net/1956/7379
10.1103/physreva.83.033414
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Multiphoton ionization and stabilization of helium in superintense xuv fields
Publisher: American Physical Society
Description: 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.
Journal Article
publishedVersion
URI: http://localhost:80/handle/1956/7379
More Information: Physical Review A 83: 033414
1050-2947
1094-1622
http://hdl.handle.net/1956/7379
10.1103/physreva.83.033414
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Multiphoton ionization and stabilization of helium in superintense xuv fields
Publisher: American Physical Society
Description: 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.
Journal Article
publishedVersion
URI: http://localhost:80/handle/1956/7379
More Information: Physical Review A 83: 033414
1050-2947
1094-1622
http://hdl.handle.net/1956/7379
10.1103/physreva.83.033414
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.