Laser intensity dependence of nonsequential double ionization of argon atoms by elliptically polarized laser pulses

Abstract

With a classical ensemble model, we investigate the intensity dependence of nonsequential double ionization (NSDI) of argon atoms by elliptically polarized laser pulses. The results show that the correlated behavior of two electrons along the long axis of the laser polarization plane depends on the laser intensity. At the relatively high intensity, the correlated electron momentum spectrum displays a correlated behavior and shows V-like structures in the first and third quadrants. At the relatively low intensity, the correlated electron momentum spectrum shows a strongly anticorrelated behavior. For the different laser intensities, the momentum spectra of two electrons along the short axis of the laser polarization plane all show strongly anticorrelated behaviors. The analysis of the classical trajectories of NSDI shows that the final-state electron repulsion plays a decisive role in both the V-like shape along the long axis of the laser polarization plane and the anticorrelated behavior along the short axis of the laser polarization plane.