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We apply and analyze the concept of mapping ionization time on to the final momentum distribution to the correlated electron dynamics in the nonsequential double ionization of helium in a strong laser pulse (λ=800 nm) and show how the mapping provides insight into the double ionization dynamics. To this end, we study, by means of numerical integration of the time-dependent Schrodinger equation of a fully correlated model atom, the temporal evolution of the center-of-mass momentum in a short laser pulse. Our results show that in the high intensity regime (I0=1.15×1015 W cm-2), the mapping is in good agreement with a classical model including binary and recoil rescattering mechanisms. In the medium intensity regime (I0=5×1014 W cm-2), we identify additional contributions from the recollision-induced excitation of the ion followed by subsequent field ionization (RESI).

Time-resolved mapping of correlated electron emission from helium atom in an intense laser pulse