Dynamic of charge asymmetric dissociation in strong laser fields

We perform a comparison study on the dynamics of double-ionization induced charge asymmetric dissociation (CAD) in two isoelectronic diatomic molecules, CO and N$_2$. With ultrahigh temporal resolution time-of-flight measurements, CAD channel C$^{2+}$+O shows a clear intensity dependence for its kinetic energy release (KER). This is interesting because a neutral atom presents in the dissociation and thus, the channel should not gain a significant amount of Coulomb energy during the molecule dissociation. In comparison, the counterpart CAD channel N$^{2+}$+N has nearly a constant KER. Our studies show that the C$^{2+}$+O channel is predominantly produced through a sequential process whereas the N$^{2+}$+N channel involves a nonsequential transition. Their distinctly different dynamics are attributed to the different electronic configurations of the two isoelectronic molecules.