] dark state located at ~15.8 eV are about 5 -20 times stronger for the Henning sharp series, favoring pathways that ultimately emit from these sharp states. As a result, the diffuse-to-sharp pathway depicted in Fig. should represent the largest contribution to FWM emission, resulting in decays characteristic of the initial Henning diffuse state and emission from the final Henning sharp state. Although nonresonant interactions, higher-order processes, and strong field effects may also influence the intensity and temporal evolution of the emitted signals, the pathways predicted to dominate by this perturbative approach are consistent with the experimental observations of lifetimes with timescales less than 100 fs emitting at the energies of the Henning sharp series.