Figure 2
From: Nonsequential double ionization with mid-infrared laser fields
Electron momentum correlation spectra along the longitudinal direction.
P1z and P2z denote the momentum components of the two emitted electrons along the laser polarization (longitudinal) direction, respectively. The data were not symmetrized. The upper row (a,b) is for laser intensity 1.0 × 1014 W/cm2 and the lower row (c,d) is for intensity 4.0 × 1013 W/cm2. The left column (a,c) is with 800 nm and the right column (b,d) is with 3200 nm.
