  We compute molecular continuum orbitals in the single center expansion
scheme. We then employ these orbitals to obtain molecular Auger rates and
single-photon ionization cross sections to study the interaction of N2 with
Free-Electron-Laser (FEL) pulses. The nuclei are kept fixed. We formulate rate
equations for the energetically allowed molecular and atomic transitions and we
account for dissociation through additional terms in the rate equations.
Solving these equations for different parameters of the FEL pulse, allows us to
identify the most efficient parameters of the FEL pulse for obtaining the
highest contribution of double core hole states (DCH) in the final atomic ion
fragments. Finally we identify the contribution of DCH states in the electron
spectra and show that the DCH state contribution is more easily identified in
the photo-ionization rather than the Auger transitions.
