Taking the Convergent Close-Coupling Method beyond Helium: The Utility of the Hartree-Fock Theory

Abstract

The convergent close-coupling (CCC) method was initially developed to describe electron scattering on atomic hydrogen and the hydrogenic ions such as He+. The latter allows implementation of double photoionization (DPI) of the helium atom. For more complex single valence-electron atomic and ionic targets, the direct and exchange interaction with the inner electron core needs to be taken into account. For this purpose, the Hartree-Fock (HF) computer codes developed in the group of Miron Amusia have been adapted. In this brief review article, we demonstrate the utility of the HF technique by examples of electron scattering on Li and the DPI of the H− and Li− ions. We also discuss that modern-day computer infrastructure allows the associated CCC code, and others, to be readily run directly via the Atomic, Molecular and Optical Science Gateway.

An analysis Differential Cross Section for Helium Atom Photo Double-Ionization

“…In light of this, it is quite worrying anytime there are major not fully explained differences between theory and experiment. A three-body collision problem is an example where there was a discrepancy the typical Coulomb e-H excitation of the 2p state in the angular correlation parameters [11], [12].…”

“Atoms” Special Issue (Many-Electron and Multiphoton Atomic Processes: A Tribute to Miron Amusia)

“…This development has aided and stimulated many other fields of computational atomic physics. Bray et al [9] have utilized the HF method to take the convergent close-coupling (CCC) method beyond the simplest hydrogen and helium atoms [10,11]. The CCC method was initially developed to describe electron scattering on atomic hydrogen and hydrogenic ions, such as He + .…”