Schematic potential energy diagram illustrating the formation and dissociation of the TNI. In addition, the resulting ion yield as function of initial electron energy is shown on the right hand side (see text for detailed explanation). In a more advanced description of the DEA process also autodetachment from the TNI, which is possible up to the distance RA between A and B⁻, is taken into account. This leads to a slight shift of the peak maximum toward lower energies.