Classical support for non-dispersive two electron wave packets in the driven helium atom

in Journal of Physics : B Atomic Molecular & Optical Physics (1998), 31(11), 489-495

We present numerical evidence for the existence of a classically non-ionizing, highly correlated two-electron configuration which emerges from the frozen planet configuration of helium exposed to an ... [more ▼]

We present numerical evidence for the existence of a classically non-ionizing, highly correlated two-electron configuration which emerges from the frozen planet configuration of helium exposed to an electromagnetic field of linear polarization. A static electric field parallel to the polarization axis prevents this configuration from transverse ionization. We argue that the corresponding nonlinear resonance island in 12D phase space supports nondispersive wave packets of the helium atom in combined oscillating and static electric fields. [less ▲]

Theory of laser-induced dielectronic recombination: A case study in Helium

in Zeitschrift für Physik. D, Atoms, Molecules, and Clusters (1997), 39(3), 173-180

We present the theoretical description of laser-induced dielectronic recombination in the density matrix formalism and show how the continuum components can be eliminated. The resulting equations are ... [more ▼]

We present the theoretical description of laser-induced dielectronic recombination in the density matrix formalism and show how the continuum components can be eliminated. The resulting equations are applied to the calculation of specific recombination processes in Helium from the point of view of resolving the involved autoionizing states in the recombination spectrum. We examine how the shape of the spectrum depends on the laser pulse duration in processes in which the autoionizing state to which the system recombines is coupled to a bound state. In addition, we consider processes in which the autoionizing state is coupled to another autoionizing state and discuss the possibility of resolving the resonance in the recombination spectrum. [less ▲]

Theory of laser-induced two-step electron-ion recombination

in Zeitschrift für Physik. D, Atoms, Molecules, and Clusters (1996), 37(1), 19-27

A theoretical framework for the quantitative interpretation of laser-induced electron-ion recombination is presented in terms of the density matrix taking into account stochastic bandwidth and pulse ... [more ▼]

A theoretical framework for the quantitative interpretation of laser-induced electron-ion recombination is presented in terms of the density matrix taking into account stochastic bandwidth and pulse duration of the laser. The theory deals with recombination induced from the continuum into one group of states by one laser and further stabilized into a lower group of states by a second laser. Rate equations are then derived from the complete density matrix, and the conditions for their validity are discussed. Both density matrix and rate equations are applied to the interpretation of a recent experiment with equally good agreement. [less ▲]