Collisions with atoms and molecules calculated with the Convergent Close-Coupling method

There has been immense progress in the field of (anti)electron scattering on atoms and molecules in the last few decades. Though historically excitation and ionization processes have been, and continue to be, categorized as different subfields, it has been shown that computational methods which aim to fully solve the underlying Schroedinger equation yield accurate results for both. One of these methods is the Convergent Close-Coupling (CCC) method. It expands the total wavefunction of the collision system in a truncated complete basis and convergence in the results of interest is obtained by simply increasing the basis size. The CCC method first solved the e-H collision excitation problem in the early 1990s, and then showed how to obtain fully differential ionization results around ten years later. More recently our attention has turned to the e-H₂ collision system. It is fair to say that the CCC method for this molecular target system is where CCC code was for the atomic targets some 30 years ago. In the presentation we will review the many applications of the CCC method to collisions involving atomic and molecular targets. We will also discuss the availability of the atomic CCC code via the AMP Gateway (https://ampgateway.org).