Now, we present the analysis of the time-resolved pump-probe measurements for our system. The pump pulse was a strong-field IR (810 nm) laser pulse with an estimated peak power of 3 × 10 13 W/cm 2 . This pulse initiated the ionization and fragmentation dynamics in FLU, which was described in the previous section. The probe pulse was a weaker VIS pulse (405 nm) produced from the same laser system. The comparison of the pump-only, probe-only, and pump-probe averaged MS is given in the ESI. We monitor various observables (various ion and electron yields) as a function of the delay between pump and probe pulses (t). We chose the temporal overlap of both pulses (t 0 ) to be at t = 0. The region in which the probe pulse comes before the pump pulse is t < 0, and the region in which the probe comes after the pump is t > 0.