Figure 1

Double ionization of neon at $1.9\times {10}^{14}\mathrm{W}/{\mathrm{cm}}^2$, 800 nm, 40 fsec. (a) Horizontal axis: momentum of electron $a$ parallel to the polarization direction. Vertical axis: momentum of electron $b$ parallel to the polarization direction. The areas indicated by the circles show the region of events selected in (b) and (c). (b) Momentum components of electron $b$ in the plane perpendicular to the polarization; the perpendicular momentum of electron $a$ is along the positive $y$ axis as shown by the arrow. Only events within the circles in region A have been selected. (c) Same as (b) but for events in circles in region B.Reuse & Permissions

Figure 2

Angular distribution of electron $b$. The polarization axis is horizontal, $10<(E_a+E_b)<24\mathrm{eV}$. (a) All electrons with an energy sharing $0.25<E_{b,\mathrm{rel}}<0.75$ (see text). Integrated over all angles and energies of electron $a$, (b) as (a) but for a fixed polar angle ${\theta }_a=30°\pm 10°$ of electron $a$. Both electrons are coplanar [azimuthal angle $({\varphi }_a-{\varphi }_b)<0°\pm 40°$ lower half and $({\varphi }_a-{\varphi }_b)<180°\pm 40°$ upper half]. Shown is the differential rate $d{\sigma }^4/d{E}_{1}d{E}_{2}d{\Omega }_{a}d{\Omega }_b$. (c),(d) Corresponding data to (a) and (b) but for an energy sharing of $0.05<E_{b,\mathrm{rel}}<0.25$.Reuse & Permissions

Figure 3

As Fig. 2b, but for equal energy sharing $0.25<E_{b,\mathrm{rel}}<0.75$, and (a) ${\theta }_a=15°\pm 5°$, (b) ${\theta }_a=35°\pm 15°$, (c) ${\theta }_a=75°\pm 15°$.Reuse & Permissions