Potential energy curve of the X2 Sigma(u)+ resonance state of F(2)(-) computed by CAP/CI

Calculations of resonance energies and widths of the X-2 Sigma(u)(+) state of F-2(-) were carried out. Configuration interaction was used to solve the Schrodinger equation for a molecular electronic Hamiltonian augmented by a complex absorbing potential (CAP/CI). Several technical aspects of this me thod are briefly discussed. The crossing point of the anionic curve of this state with the ground state of F-2 is determined as the point where the re sonance width vanishes. Based on this, the electron affinity of atomic fluo rine is reproduced with satisfactory precision. Finally, our results are co mpared to those of several preceding studies and an outlook to further cont inuation of this project is given.