Ultrafast dissociation dynamics of singly and doubly ionized N2O in strong laser fields

We study the ultrafast dissociation of singly and doubly ionized N2O molecules using strong IR-laser pump and IR-laser probe techniques in combination with the three-body (N+ N+O+ coincidence measurement. Two time-dependent kinetic energy release bands are observed and assigned as ultrafast evolutions after further ionization of N2O+ and N2O2+. The real-time bond stretching and structure bending are observed from N2O+ populated on the B-2 Pi state, and the kinetic energy correlation between N+ and O+ ions reveals that the concerted fragmentation dominates while the contribution of sequential fragmentation increases with time. Two two-body and two three-body fragmentation pathways of N2O2+ are assigned, and the ultrafast dissociation processes are tracked by measuring the time-dependent Dalitz distributions and kinetic energy correlations between N+ and O+ ions.