  When intense laser pulses release correlated electrons, the time delay
between the ionizations may last more than one laser cycle. We show that this
"Recollision-Excitation with Subsequent Ionization" pathway originates from the
inner electron being promoted to a sticky region by a recollision where it is
trapped for a long time before ionizing. We identify the mechanism which
regulates this region, and predict oscillations in the double ionization yield
with laser intensity.
