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Binary and Recoil Collisions in Strong Field Double Ionization of Helium

2007; American Physical Society; Volume: 99; Issue: 26 Linguagem: Inglês

10.1103/physrevlett.99.263002

1092-0145

A. Staudte, Camilo Ruíz, M. S. Schöffler, S. Schößler, D. Zeidler, Th. Weber, M. Meckel, D. M. Villeneuve, P. B. Corkum, Andreas Becker, R. Dörner,

Laser-Plasma Interactions and Diagnostics

We have investigated the correlated momentum distribution of both electrons from nonsequential double ionization of helium in a 800 nm, 4.5 x 10(14 W/cm2 laser field. Using very high resolution coincidence techniques, we find a so-far unobserved fingerlike structure in the correlated electron momentum distribution. The structure can be interpreted as a signature of the microscopic dynamics in the recollision process. We identify features corresponding to the binary and recoil lobe in field-free (e,2e) collisions. This interpretation is supported by analyzing ab initio solutions of a fully correlated three-dimensional helium model.