Signatures of chaos in strong-field double ionization
Résumé
When intense laser pulses release correlated electrons, the time delay between the ionizations may last more than half a laser period. We show that this "Recollision-Excitation with Subsequent Ionization" pathway originates from chaotic dynamics in the double ionization process. The long delays after the first ionization are caused by "sticky" regions in phase space, and the unstable manifold of a particular periodic orbit regulates the second ionization. The oscillations observed in the corresponding double ionization yields versus the laser intensity are a signature of chaotic processes in two-active electron systems.
Domaines
Physique Atomique [physics.atom-ph]
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