36,168 research outputs found
Strong field double ionization of H2 : Insights from nonlinear dynamics
The uncorrelated (``sequential'') and correlated (``nonsequential'') double
ionization of the H2 molecule in strong laser pulses is investigated using the
tools of nonlinear dynamics. We focus on the phase-space dynamics of this
system, specifically by finding the dynamical structures that regulate these
ionization processes. The emerging picture complements the recollision scenario
by clarifying the distinct roles played by the recolliding and core electrons.
Our analysis leads to verifiable predictions of the intensities where
qualitative changes in ionization occur. We also show how these findings depend
on the internuclear distance
Relativistic effects in the chaotic Sitnikov problem
We investigate the phase space structure of the relativistic Sitnikov problem
in the first post-Newtonian approximation. The phase space portraits show a
strong dependence on the gravitational radius which describes the strength of
the relativistic pericentre advance. Bifurcations appearing at increasing the
gravitational radius are presented. Transient chaotic behavior related to
escapes from the primaries are also studied. Finally, the numerically
determined chaotic saddle is investigated in the context of hyperbolic and
non-hyperbolic dynamics as a function of the gravitational radius.Comment: 8 pages, 11 figure
- …