In previous studies on PFAS degradation with excess electrons, it was noted that the initial site of the C-F bond dissociation was random. Our studies with excess electrons also support these findings; however, we observe different dynamics for the hydrated electron. In Figure , the F-H w radial distribution functions have sharp peaks near 1.58 Å, which is larger than the conventional H-F covalent bond distance of 0.91 Å and indicates a strongly hydrogen-bonded fluoride anion by water molecules. However, for an excess electron, the F-H w radial distribution function has peaks near 1.00 Å as well as 1.58 Å. The F-H w peak near 1.00 Å indicates formation of an H-F molecule as a by-product, which is not found in the hydrated electron simulations.