For the states corresponding to peaks a-j, the representative wavefunctions are exclusively distributed in the product channel. In the region of highest amplitude near the PC equilibrium geometry, these wavefunctions show two nodes along rHF, indicating that these peaks correspond to HF (vHF = 2) complexed to NH2, while only one such node is seen at large NH2-HF distances. This feature suggests that these quasibound resonances dissociate to HF(vHF = 1) + NH2 products. Moreover, there is nodal structure along the NH2-HF coordinate, indicating excitation of the NH2-HF translational mode that leads to dissociation to products. Finally, as discussed in the SI, 2D cuts along angular coordinates reveal additional nodal structures, indicating that these transitions involve excitations of at least one other soft mode of the PC complex. The observed spacing of ~300 cm -1 is assigned to excitations in the HF-NH2 translational mode (v8 = 251 cm -1 ) and the pseudo-rotation of HF coupled with the NH2 out-of-plane wagging (v6 = 829 cm -1 ).