Partial electron yield spectrum of N2: doubly excited states at the K-shell threshold

Abstract The partial electron yield spectrum of N 2 has been measured at a kinetic energy corresponding to the Auger decay of doubly excited core–hole states. The spectrum reveals previously unresolved double excitations just below and above the K-shell ionization threshold. Their excitation energies and dissociative nature agree with calculated potential energy curves of the doubly excited states.