A recent rejuvenation of experimental and theoretical interest in the physics of few-body
systems has provided deep, fundamental insights into a broad range of problems. Few-body …

We review topics of current interest in the physics of electronic, atomic and molecular
scattering in the vicinity of thresholds. Starting from phase space arguments, we discuss the …

The Siegert states of atoms in a static uniform electric field, defined as the solutions to the
stationary Schrödinger equation satisfying the regularity and outgoing-wave boundary …

Astronomy has provided the inspiration for several investigations in quantum physics. These
topics can serve as pedagogical vehicles for undergraduate courses in physics and …

This tutorial presents an extensive computational study of electron-impact scattering and
ionization of atomic hydrogen and hydrogenic ions, through the solution of the non …

The Siegert states of atoms and molecules in a static electric field are the solutions of the
stationary Schrödinger equation satisfying the regularity and outgoing-wave boundary …

In a study of systems with many degrees of freedom, such as those consisting of several
interacting particles, one usually seeks to follow the same methodological route, namely, a …

A theory for ion-atom collisions at low energies based on the hyperspherical close-coupling
(HSCC) method is presented. In hyperspherical coordinates the wave function is expanded …

R-matrix theory was introduced by Wigner, 1946a, Wigner, 1946b and Wigner and Eisenbud
(1947) in fundamental papers describing nuclear resonance reactions. This and other early …

We develop a method for calculating the bound state energies and the wave functions of
weakly bound triatomic molecular systems. The method is based on the use of …