1 being present in the whole range of the pump-probe delays. The new photoelectron features, different from the ATI pattern, do not appear in the PES because probe photons are just twice the energy of the IR pump photons. The transient increase in each ATI peak's intensity arises from transferring each k-th ATI peak into the (k + 2)-th peak by a probe VIS photon with 3 eV of energy (see Equation 1 and vertical arrows in Figure (b) for details). The fitted lifetimes of the transients in the ATI bands seem to decrease with increasing order of the band, going from 102 ± 4 fs to 83 ± 3 fs (Table ). However, they are all centered around 90 fs, which might indicate that the source of these ATI bands is the same set of excited states of the neutral FLU parent molecule.