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Explicit expressions of the vertex constant for the decay of a nucleus intotwo charged particles for an arbitrary orbital momentum $l$ are derived for thestandard expansion of the effective-range function $K_l(k^2)$, as well as whenthe function $K_0(k^2)$ has a pole. As physical examples, we consider the boundstate of the nucleus ${}^3\rm{He}$ and the resonant states of the nuclei${^2}$He and ${^3}$He in the s-wave, and those of ${}^5\rm{He}$ and${}^5\rm{Li}$ in the p-wave. For the systems $Np$ and $Nd$ the poletrajectories are constructed in the complex planes of the momentum and of therenormalized vertex constant. They correspond to a transition from theresonance state to the virtual state while the Coulomb forces graduallydecrease to zero.

Effect of Coulomb Forces on the Position of the Pole in the Scattering Amplitude and on Its Residue