TY - JOUR A1 - Baumgaertel, Hellmut A1 - Kaldass, Hani A1 - Komy, Soliman T1 - On spectral properties of the resonances for selected potential scattering systems N2 - The resonances (poles of the scattering matrix) of quantum mechanical scattering by central-symmetric potentials with compact support and zero angular momentum are spectrally characterized directly in terms of the Hamiltonian by a (generalized) eigenvalue problem distinguished by an additional condition (called boundary condition). The connection between the (generalized) eigenspace of a resonance and corresponding Gamov vectors is pointed out. A condition is presented such that a relation between special transition probabilities and infinite sums of residual terms for all complex-conjugated pairs of resonances can be proved. In the case of the square well potential the condition is satisfied. Y1 - 2009 UR - http://jmp.aip.org/ U6 - https://doi.org/10.1063/1.3072675 SN - 0022-2488 ER -