Abstract
With the three-dimensional classical ensemble model, we investigate the correlated electron emission in nonsequential double ionization (NSDI) of argon atoms by few-cycle laser pulses. Our calculations well reproduce the experimentally observed cross-shaped structure in the correlated two-electron momentum spectrum [ Nature Commun. 3, 813 (2012)]. By tracing these NSDI trajectories, we find that besides the process of recollision-induced excitation with subsequent ionization just before the next field maximum, the recollision ionization also significantly contributes to the cross-shaped structure.
Highlights
As a standard process for studies of dynamical electron correlations, nonsequential double ionization (NSDI) has been a hot topic in the strong field physics since the observation of the dramatically enhanced double ionization yields [1,2,3]
Previous studies have indicated that the carrier-envelope phase (CEP)-resolved correlated two-electron spectra are asymmetric with respect to the diagonal p||e1=-p||e2 and this asymmetry strongly depend on laser CEP
For NSDI events in region G2, the double ionizations occur just before the field maximum after recollision. This corresponds to recollision-induced excitation with subsequent field ionization (RESI) mechanism, which has been demonstrated responsible for the crossed-shape structure in the correlated electron momentum distribution in [34]
Summary
As a standard process for studies of dynamical electron correlations, nonsequential double ionization (NSDI) has been a hot topic in the strong field physics since the observation of the dramatically enhanced double ionization yields [1,2,3]. With the deep study of NSDI, many novel characteristics in the correlated electron momentum spectra were found [20,21,22,23,24] By means of these novel characteristics many detailed microscopic dynamics processes under the recollision mechanism have been revealed. The measured two-electron correlated spectrum exhibits a cross-shaped structure that qualitatively differs from spectra recorded in all previous experiments using many-cycle pulses. This experiment provides a benchmark data for the theoretical study of NSDI. In their semiclassical calculation they assume that for RCI mechanism the transfer energy between the returning electron and the bound electron is right equal to the second ionization potential Ip2 of argon. The calculated correlated electron momentum spectrum including the two mechanisms well reproduce the experimentally observed cross-shaped structure
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