Fig. 1 (A to C) The top panels show three-dimensional (3D) plots of the energy and population dynamics of the wet electron state on CH3OH and CH3OD/TiO2(110) surfaces for <1 to 2-ML coverages that show the strong dependence of the wet electron state dynamics on the methanol coverage and D isotope substitution. The 3D plots are constructed from 2PC measurements taken at 0.1-eV intervals. The black circles indicate the change in the resonance maximum with time. The bottom panels show the original 2PC measurements used to construct the 3D plots at several characteristic energies indicated by the color-coded arrows in (A) to (C).