Classical threshold behaviour in a 1+1-dimensional model for double ionization in strong fields

Abstract

Building on insights about the classical pathways to double ionization in strong laser fields we here propose a 1+1-dimensional model that captures essentials of the 3-d potential landscape and allows efficient studies of the process in reduced dimensions. The reduction to one degree of freedom for each electron is obtained by confining their motion to lines at an angle of pi/6 with respect to the field axis; the justification for this choice is that upon variation of the electric field the Stark saddles move along the same lines. In this way we obtain a low-dimensional representation in which symmetric electron escape is possible. As a demonstration of the advantages of this model we confirm numerically the equivalent of the Wannier threshold behaviour for constant electric field and identify several classes of trajectories that can contribute to the ionization process.

7 pages, 3 figures

References in corpus (3)

• A two-dimensional, two-electron model atom in a laser pulse: exact treatment, single active electron-analysis, time-dependent density functional theory, classical calculations, and non-sequential ionization
• Wannier threshold law for two electron escape in the presence of an external electric field
• Classical analysis of correlated multiple ionization in strong fields

Cited by in corpus (14)

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• Ab initio study of time-dependent dynamics in strong-field triple ionization
• Suppression of correlated electron escape in double ionization in strong laser fields
• Delayed double ionization as a signature of Hamiltonian chaos
• Strong-field triple ionization of atoms with $p^3$ valence shell
• Pulse length effects in long wavelength driven non-sequential double ionization
• Strong-Field Double Ionization in a Three-Electron Atom: Momentum Distribution Analysis
• Quantum versus semi-classical signatures of correlated triple ionization in Dalitz plots
• Frequency dependence of nonsequential double ionization of atoms in strong laser fields
• Restricted-Geometry Quantum Models Beyond Atoms: Application of the Eckhardt-Sacha approach to NSDI in Diatomic Systems