Coupled bound and continuum eigenstates in momentum space

Described is a procedure for solving in momentum space the Coulomb plus nuclear problem for coupled bound and continuum eigenstates. The method is an extension of the Kwon-Tabakin formulation of the Lande subtraction technique. Complex eigenenergies are now determined after formulating and incorporating the correct momentum space "boundary conditions" into the Schrödinger equation. This exact numerical procedure can be applied to local or nonlocal, complex or real potentials even with relativistic kinematics. Application to the $K^{-}p$ problem and other systems with strongly coupled absorptive channels is indicated.