Accurate quantum dynamical studies are required to more quantitively interpret the experimental spectra; these are performed on the neutral PES schematically presented in Fig. . The simulated photoelectron spectra are displayed in Fig. . To better compare with the experimental data, the raw theoretical spectrum (red trace) is also convoluted with a 50 cm -1 full-width-at-half-maximum (FWHM) Gaussian function (purple trace) and shifted 104 cm -1 higher in eBE (details given in SI). The overall agreement with the main peaks of the experimental spectrum is excellent. To assign the experimental features, two-dimensional (2D) cuts of several representative wavefunctions, superimposed on the neutral PES, are displayed in Fig. . The anion wavefunction is also shown in the same figure along with the geometry of the submerged barrier.