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Electron correlation versus stabilization of atoms in intense laser pulses

Published online by Cambridge University Press:  09 April 2001

F. CECCHERINI ,
D. BAUER  and
P. MULSER
F. CECCHERINI
Affiliation:
Theoretical Quantum Electronics (TQE)*, Darmstadt University of Technology, Hochschulstr 4A, D-64289 Darmstadt, Germany
D. BAUER
Affiliation:
Theoretical Quantum Electronics (TQE)*, Darmstadt University of Technology, Hochschulstr 4A, D-64289 Darmstadt, Germany Dipartimento di Fisica, Università di Pisa, Piazza Torricelli 2, 56100 Pisa, Italy
P. MULSER
Affiliation:
Theoretical Quantum Electronics (TQE)*, Darmstadt University of Technology, Hochschulstr 4A, D-64289 Darmstadt, Germany
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Abstract

We present a numerical study of the stabilization process for a fully correlated two-electron model atom in an intense laser pulse. A comparison with calculations for a “real” 3D He atom is also done. We concentrate on the very high frequency regime, where the photon energy exceeds the ionization energy of both electrons, outer and inner. Our results show that when correlation effects are included the ionization probability (IP) is enhanced. Nevertheless, we still observe a decreasing IP within a certain intensity domain. The results from the fully correlated simulations are compared with those from simpler, approximate models. The full numerical treatment for the He atom is not yet possible. We therefore present results obtained with “single active electron” approximation and time-dependent density functional theory. Our numerical simulations can be useful for the future understanding of the stabilization phenomenon for more-than-one electron atoms.

Type
ULIA-1 CONFERENCE PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 3 , July 2000 , pp. 449 - 454
Copyright
© 2000 Cambridge University Press

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