Time-dependent density functional theory applied to nonsequential multiple ionization of Ne at 800 nm.

Time-dependent density functional theory (TDDFT) is employed to study the interaction of a Ne atom with short and strong 800\,nm laser pulses. In the intensity regime covered (10;14-10;16 W/cm;2) up to triply ionized Ne is observed. Good quantitative agreement with the experimental Ne;+ ion-yield (and the Ne;2+ -yield near saturation) is obtained. Nonsequential ionization (NSI) leads to a strong increase of the probability for double and triple ionization when compared to a single active electron (SAE)-approach. A NSI-"knee" is observed but the agreement with its experimental counterpart is not satisfactory.