Calculation of S-matrix poles by means of analytic continuation in the coupling constant: Application to the 2Πg state of N2-

The method of analytic continuation in the coupling constant in combination with use of the statistical Pade approximation is applied to the determination of resonance energy and width of the 2Πg state of N2-. It is shown that standard quantum chemistry codes provide accurate data which can be used for analytic continuation in the coupling constant, and the resonance energy and width can be inferred with an accuracy comparable to other more elaborate methods.