Electron–ion coincidence measurements on N2 after 1s photoabsorption

Results of coincidence measurements between energy selected electrons and ions after 1s photoabsorption of N2 are presented. A nitrogen 1s electron was either resonantly excited (1s → 1πg) or ionized with synchrotron radiation of hν=400.9 and 415.0 eV, respectively. The decay of the resulting 1s−1 state was traced for several strong electron emission channels by taking in coincidence time of flight mass spectra. For some decay channels fragmentation of the excited nitrogen was observed. Kinetic energies of the fragments were determined and, where possible, the molecular ionic states involved identified. A double electron emission process after resonant excitation (1s → 1πg) was observed.