Resonant states in momentum representation.

Abstract

It is shown that the method of Hernandez and Mondragon for generating the Gamow states of a local or nonlocal potential in momentum representation is equivalent to a method based on an expansion of the potential in separable kernels and Berggren's rules of handling Gamow states. The advantage of this way of producing Gamow states over the direct numerical integration of the Schroedinger equation in coordinate representation is pointed out and the feasibility in practical problems is demonstrated.