Abstract
Ensembles of 400 000 two-electron trajectories in three space dimensions
are used with Newtonian equations of motion to track atomic double
ionization under very strong laser fields. We report a variable time
lag between e-e collision and double ionization, and find that the
time lag plays a key role in the emergence directions of the electrons.
These are precursors to production of electron momentum distributions
showing substantial new agreement with experimental data.
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