Controlling double ionization of atoms in intense bichromatic laser pulses

Details Controlling double ionization of atoms in intense bichromatic laser pulses Controlling double ionization of atoms in intense bichromatic laser pulses

2010-11-11

arxiv.org/abs/1011.2558v1

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 83, 3 (2011) 036211

Nonlinear Sciences

Chaotic Dynamics

Scientific paper

10.1103/PhysRevE.83.036211

We consider the classical dynamics of a two-electron system subjected to an intense bichromatic linearly polarized laser pulse. By varying the parameters of the field, such as the phase lag and the relative amplitude between the two colors of the field, we observe several trends from the statistical analysis of a large ensemble of trajectories initially in the ground state energy of the helium atom: High sensitivity of the sequential double ionization component, low sensitivity of the intensities where nonsequential double ionization occurs while the corresponding yields can vary drastically. All these trends hold irrespective of which parameter is varied: the phase lag or the relative amplitude. We rationalize these observations by an analysis of the phase space structures which drive the dynamics of this system and determine the extent of double ionization. These trends turn out to be mainly regulated by the dynamics of the inner electron.

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