Abstract
We have investigated the correlated momentum distribution of both electrons from nonsequential double ionization of helium in a 800 nm, 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 () collisions. This interpretation is supported by analyzing ab initio solutions of a fully correlated three-dimensional helium model.
- Received 14 May 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.263002
©2007 American Physical Society