Recoil collisions as a portal to field assisted ionization in the strong field ionization of diatomic molecules

We explore the dependence of the double ionization of diatomic molecules on the frequency of a strong laser field while keeping the ponderomotive energy constant. For the case of the He atom we have recently found [1] that as we increase the frequency we find that the remarkable ``finger-like'' structure for high momenta recently found for $\omega$=0.055a.u. for the double ionization of the He atom [2] persists for higher frequencies. We compare and discuss the differences between the ``finger-like'' structure in the correlated momenta of strongly driven diatomic molecules versus two electron atoms. \\[4pt] [1] A. Emmanouilidou, Phys. Rev. A 78, 023411 (2008).\\[0pt] [2] A. Staudte et al., Phys. Rev. Lett. 99, 263002 (2007);A. Rudenko et al., Phys. Rev. Lett. 99, 263003 (2007)