Electron-ion coincidence measurements on N2 after 1s photoabsorption

Results of coincidence measurements between energy selected electrons and ions after Is photoabsorption of N-2 are presented. A nitrogen Is electron was either resonantly excited (1s --> 1 pi(g)) or ionized with synchrotron radiation of hv = 400.9 and 415.0 eV, respectively. The decay of the resulting 1 s(-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 (Is --> 1 pi(g)) was observed. (C) 1998 Elsevier Science B.V.