Improved model for the dissociative sequential double ionization of nitrogen molecules by an intense few-cycle infrared laser pulse

A density matrix approach was recently developed by Yuen and Lin to study the dissociative sequential double ionization (SDI) of N₂ molecules induced by an intense few-cycle infrared laser pulse Phys. Rev. A 106, 023120 (2022). Despite the positions and relative ratios of peaks in the simulated kinetic energy release (KER) spectrum agreeing very well with experiments, the experimental KER spectrum is considerably broader than that obtained from the simulation where both laser couplings between N₂^2+ states and the nuclear vibration distribution of neutral N₂ molecules were neglected. Here, we revisit to simulate the experiment by Voss et al. J. Phys. B: At. Mol. Opt. Phys. 37, 4239 (2004) and Wu et al. J. Phys. Chem. A 114, 6751 (2010) and find that the agreement between the simulated KER spectra and the experiments is improved significantly by considering the laser couplings between N₂^2+ states and nuclear vibration distribution of neutral N₂ molecules. This work provides further insights into the SDI dynamics and the influences of nuclear motion on the SDI of molecules.