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

Abstract

Owing to its numerical simplicity, a two-dimensional two-electron model atom, with each electron moving in one direction, is an ideal system to study non-perturbatively a fully correlated atom exposed to a laser field. Frequently made assumptions, such as the ``single active electron''- approach and calculational approximations, e.g. time dependent density functional theory or (semi-) classical techniques, can be tested. In this paper we examine the multiphoton short pulse-regime. We observe ``non-sequential'' ionization, i.e.\ double ionization at lower field strengths as expected from a sequential, single active electron-point of view. Since we find non-sequential ionization also in purely classical simulations, we are able to clarify the mechanism behind this effect in terms of single particle trajectories. PACS Number(s): 32.80.Rm

10 pages, 16 figures (gzipped postscript), see also http://www.physik.tu-darmstadt.de/tqe/

References in corpus (1)

• Ejection Energy of Photoelectrons in Strong Field Ionization

Cited by in corpus (34)

• Classical simulations including electron correlations for sequential double ionization
• Electron-electron dynamics in laser-induced nonsequential double ionization
• Rabi Oscillations and Few-Level Approximations in Time-Dependent Density Functional Theory
• Efficient grid-based method in nonequilibrium Green's function calculations. Application to model atoms and molecules
• Time-dependent second Born calculations for model atoms and molecules in strong laser fields
• Time resolved quantum dynamics of double ionization in strong laser fields
• Adiabatic Approximation of the Correlation Function in the Density-Functional Treatment of Ionization Processes
• Nonsequential Double Recombination in Intense Laser Fields
• Bohmian mechanics in the exact factorization of electron-nuclear wavefunction
• Improved one-dimensional model potentials for strong-field simulations
• Momentum distributions in time-dependent density functional theory: Product phase approximation for non-sequential double ionization in strong laser fields
• Quantum model for double ionization of atoms in strong laser fields
• Making Distinct Dynamical Systems Appear Spectrally Identical
• Ab initio study of time-dependent dynamics in strong-field triple ionization
• Time-dependent renormalized natural orbital theory applied to the two-electron spin-singlet case: ground state, linear response, and autoionization
• A systematic construction of Gaussian basis sets for the description of laser field ionization and high-harmonic generation
• Equations of motion for natural orbitals of strongly driven two-electron systems
• Restricted space ab initio models for double ionization by strong laser pulses
• Classical threshold behaviour in a 1+1-dimensional model for double ionization in strong fields
• Nonsequential double ionization with time-dependent renormalized-natural-orbital theory
• Dark and bright autoionizing states in resonant high harmonic generation: simulation via 1D helium model
• Many-electron effects of strong-field ionization described in an exact one-electron theory
• Periodicity of the time-dependent Kohn-Sham equation and the Floquet theorem
• Density-based one-dimensional model potentials for strong-field simulations in $\text{He}$, ${\text{H}}_2^{+}$ and ${\text{H}}_2$
• Electron correlations in the antiproton energy loss distribution in He
• Strong-field absorption and emission of radiation in two-electron systems calculated with time-dependent natural orbitals
• Suppression of correlated electron escape in double ionization in strong laser fields
• One-dimensional model potentials optimized for the calculation of the HHG spectrum
• Finite elements and the discrete variable representation in nonequilibrium Green's function calculations. Atomic and molecular models
• Strong-field double ionization dynamics of vibrating HeH${}^{+}$ versus HeT${}^{+}$
• Double-electron ionization driven by inhomogeneous fields
• Single-photon double ionization: renormalized-natural-orbital theory vs multi-configurational Hartree-Fock
• Potential energy surfaces for electron dynamics from a model of localized Gaussian wave packets with valence-bond spin-coupling: high-harmonic generation spectra from H and He atoms
• Restricted-Geometry Quantum Models Beyond Atoms: Application of the Eckhardt-Sacha approach to NSDI in Diatomic Systems