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We explore the dependence of the double ionization of the He atom on thefrequency of a strong laser field while keeping the ponderomotive energyconstant. 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 thatprevails in the correlated momenta distribution. The role of this structure asa signature of the frequency dependence of non-sequential double ionization isdiscussed.

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