A general model and toolkit for the ionization of three or more electrons in strongly driven atoms using an effective Coulomb potential for the interaction between bound electrons
arXiv:2201.12160 · doi:10.1103/PhysRevA.105.043102
Abstract
We formulate a three-dimensional semi-classical model to address triple and double ionization in three-electron atoms driven by intense infrared laser pulses. During time propagation, our model fully accounts for the Coulomb singularities, the magnetic field of the laser pulse and for the motion of the nucleus at the same time as for the motion of the three electrons. The framework we develop is general and can account for multi-electron ionization in strongly-driven atoms with more than three electrons. To avoid unphysical autoionization arising in classical models of three or more electrons, we replace the Coulomb potential between pairs of bound electrons with effective Coulomb potentials. The Coulomb forces between electrons that are not both bound are fully accounted for. We develop a set of criteria to determine when electrons become bound during time propagation. We compare ionization spectra obtained with the model developed here and with the Heisenberg model that includes a potential term restricting an electron from closely approaching the core. Such spectra include the sum of the electron momenta along the direction of the laser field as well as the correlated electron momenta. We also compare these results with experimental ones.
References in corpus (23)
- Correlated multi-electron dynamics in ultrafast laser pulse - atom interactions
- Classical simulations including electron correlations for sequential double ionization
- Classical Trajectory Diagnosis of Finger-Like Pattern in the Correlated Electron Momentum Distribution for Helium Double Ionization
- Classical collisional trajectories as the source of strong-field double ionization of helium in the knee regime
- Explicit methods in extended phase space for inseparable Hamiltonian problems
- Correlated electron emission in laser-induced nonsequence double ionization of Helium
- Relativistic features and time delay of laser-induced tunnel-ionization
- Recoil collisions as a portal to field assisted ionization at near-UV frequencies in the Strong Field Double Ionization of Helium
- In-plane Theory of Non-Sequential Triple Ionization
- Double photo-electron momentum spectra of Helium at infrared wavelength
- Non-sequential triple ionization in strong fields
- Direct versus Delayed pathways in Strong-Field Non-Sequential Double Ionization
- The Coulomb four-body problem in a classical framework: Triple photoionization of lithium
- A toolkit for semiclassical computations for strongly-driven molecules: "frustrated" ionization of H driven by elliptical laser fields
- Slingshot non-sequential double ionization as a gate to anti-correlated two electron escape
- Evidence for a {\bf T}-shape break-up pattern in the triple photoionization of Li
- Initial state dependence in multi-electron threshold ionization of atoms
- Ab initio study of time-dependent dynamics in strong-field triple ionization
- Three-electron correlations in strong laser field ionization: Spin induced effects
- Strong-field triple ionization of atoms with valence shell
- Triple ionization and "frustrated" triple ionization in triatomic molecules driven by intense laser fields
- Enhancing spin polarization using ultrafast angular streaking
- Signatures of magnetic field effects in non-sequential double ionization manifesting as back-scattering for molecules versus forward-scattering for atoms