| Issue |
Europhys. Lett.
Volume 62, Number 5, June 2003
|
|
|---|---|---|
| Page(s) | 691 - 697 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2003-00428-0 | |
| Published online | 01 May 2003 | |
Quasi-simultaneous double ionization of helium in super-intense high-frequency laser pulses
1
Theoretische Quantendynamik, Physikalisches Institut, Universität Freiburg Hermann-Herder-Str. 3, D-79104 Freiburg, Germany
2
Interdisziplinäres Zentrum für wissenschaftliches Rechnen, Universität Heidelberg Im Neuenheimer Feld 368, D-69120 Heidelberg, Germany
Corresponding authors: astaudt@physik.uni-freiburg.de keitel@uni-freiburg.de
Received:
21
March
2003
Accepted:
9
April
2003
In super-intense laser pulses beyond the tunneling regime, non-sequential double ionization is known to be of little significance, especially due to the laser-induced Lorentz force. We show that, for such intense fields, electron-electron repulsion does still play a crucial role in the case of quasi-instantaneous double ionization with long electron-electron interaction times at short separations. For this purpose the time-dependent quantum dynamics and the angular ionization yields are investigated for a model helium atom beyond the dipole approximation.
PACS: 32.80.Rm – Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) / 32.80.Fb – Photoionization of atoms and ions / 42.50.Hz – Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic Stark shift
© EDP Sciences, 2003
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