Structure and fragmentation dynamics of N2+2 ions in double photoionization experiments

A detailed analysis of the spectroscopy of the N-2(2+) dication has been performed at the vibrational level. Two coincidence experiments have been used for that purpose: a pulsed VUV lamp associated with a magnetic bottle time-of-flight spectrometer (time-of-flight photoelectron-photoelectron coincidence method) and synchrotron radiation associated with a threshold electron selector (threshold photoelectrons coincidence method). Combined with ion detection, this last technique reveals, from one side, new properties of N-2(2+) dissociation and, from the other side, what appears to be the first observation of fluorescence by this method allowing us to study the competition between fluorescence and dissociation in the D-1 Sigma(+)(u) vibrational levels.