Recoil collisions as a portal to field assisted ionization at near-UV frequencies in the Strong Field Double Ionization of Helium

Abstract

We explore the dependence of the double ionization of the He atom on the frequency of a strong laser field while keeping the ponderomotive energy constant. As we increase the frequency we find that the remarkable "finger-like" structure for high momenta recently found for $\omega =0.055$ a.u. \cite{Staudte, Rudenko} persists for higher frequencies. At the same time, at $\omega =0.187$ a.u. a new X-shape structure emerges for small momenta that prevails in the correlated momenta distribution. The role of this structure as a signature of the frequency dependence of non-sequential double ionization is discussed.

References in corpus (3)

• Classical collisional trajectories as the source of strong-field double ionization of helium in the knee regime
• Correlated electron emission in laser-induced nonsequence double ionization of Helium
• Time resolved quantum dynamics of double ionization in strong laser fields

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