[en] We show that the simple to-amplitude Blair-Anholt formula for ionization in the presence of a nuclear resonance can be generalized to electron capture. The generalization has been obtained from a fully quantum mechanical treatment by performing approximations which are the large-angle counterpart of those used to obtain the standard semiclassical t matrix for forward scattering. The resulting formula involves electronic amplitudes which must be calculated for a prescribed broken straight line nuclear trajectory. Application of this simple two-amplitude formula to different systems shows that it is able to describe the gross features of the electron capture across a nuclear resonance. (Author)