Dynamic Exchange in the Strong Field Ionization of Molecules

We show that dynamic exchange is a dominant effect in strong field ionization of molecules. In CO2 it fixes the peak ionization yield at the experimentally observed angle of 45 degrees between polarization direction and the molecular axis. For O-2 it changes the angle of peak emission and for N-2 the alignment dependence of yields is modified by up to a factor of 2. The effect appears on the Hartree-Fock level as well as in full ab initio solutions of the Schrodinger equation.