V-like structure in the correlated electron momentum distribution for nonsequential double ionization of helium

Tóm tắt

We investigate the nonsequential double ionization process of He atom by using classical three-dimensional ensemble model. The result shows that a pronounced V-like structure is exhibited in the two-electron momentum distribution along the laser polarization axis. At high laser intensity, this structure which was observed experimentally [Phys. Rev. Lett. 99, 263003 (2007)] can be explained by the asymmetric energy sharing of two electrons at recollision process.