Binary and recoil collisions in strong field double ionization of helium.
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.
Staudte
A
A
National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada. andre.staudte@nrc.ca
Ruiz
C
C
Schöffler
M
M
Schössler
S
S
Zeidler
D
D
Weber
Th
T
Meckel
M
M
Villeneuve
D M
DM
Corkum
P B
PB
Becker
A
A
Dörner
R
R