Intensity dependence in nonsequential double ionization of helium

This is the authors' abstract. We don't add key points for this paper.

Using the quantitative rescattering model, we simulate the correlated two-electron momentum distributions for nonsequential double ionization of helium by 800 nm laser pulses at intensities in the range of (2 − 15) × 1014 W/cm2. The experimentally observed V-shaped structure at high intensities [ Phys. Rev. Lett. 99 , 263003 ( 2007 ) 10.1103/PhysRevLett.99.263003 ] is attributed to the strong forward scattering in laser-induced recollision excitation and the asymmetric momentum distribution of electrons that are tunneling-ionized from the excited states. The final-state electron repulsion also plays an important role in forming the V-shaped structure.