As discussed in paper I, C EE reports couplings between solvent motions and the energy levels of the excess electron, and FlexiBLE was seen to reproduce C EE from full-system calculations at the MQC level, indicating the bias potential did not measurably influence solvent motions that couple to the excess electron. To directly reveal the electron-coupled solvent motions, we take the Fourier transform of C EE (t), and display the result in Fig. . We focus on the frequency range of 1000-4000 cm -1 , which reports couplings to the intramolecular vibrations of water, and allows comparison to experimental Resonance Raman (RR) spectroscopy. As Fig. (a) shows, the energy gap fluctuations of e -