A density matrix (DM) approach has been successfully developed for modeling the dissociative sequential double ionization of molecules driven by ultrashort intense infrared laser pulses. Here, we extend the DM method to theoretically study the dissociative sequential triple ionization of nitrogen molecules. We first calculate potential-energy curves of the ${\mathrm{N}}_2^{3+}$ states and the transition dipole moments between these ${\mathrm{N}}_2^{3+}$ states using the complete active state self-consistent field method. Using the DM method, we calculate the kinetic-energy release (KER) spectra for the ${\mathrm{N}}_2^{3+}$ dissociating through the ${\mathrm{N}}^{2+}+{\mathrm{N}}^{+}$ channel. We find that our simulated KER spectra agree well with the experimental data by Wu et al. [Phys. Chem. Chem. Phys. 13, 18398 (2011)]. This Letter provides a simple model for theoretically investigating the molecular dissociative sequential triple ionization.

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• Atomic & molecular processes in external fields