Electron-impact ionization of the hydrogen atom is the prototypical three-body Coulomb
breakup problem in quantum mechanics. The combination of subtle correlation effects and …

The substantial progress that has occurred during the 1990s in the field of electron-atom-
collision theory is discussed. We show how a solution of a small-model three-body problem …

The past decade has seen extraordinary theoretical progress in the field of fully
kinematically resolved atomic electron-impact ionisation, and its closely related field of …

The convergent close-coupling method is shown to overcome the remaining discrepancies
with experiment of electron-hydrogen ionization. Consequently, this method is able to …

We determine, both experimentally and theoretically, the fully resolved fivefold differential
cross section (5DCS) of double ionization of helium by 5.6 keV electron impact. Symmetric …

We report fully differential cross section (FDCS) calculations and absolute measurements for
ion-atom impact ionization. Using the COLTRIMS (cold target recoil ion momentum …

The study of structure and collision processes of three-and four-body problems has seen an
extraordinary progress in the last decades. This progress has been in part associated to the …

The atomic hydrogen target has played a pivotal role in the development of quantum
collision theory. The key complexities of computationally managing the countably infinite …

The double photoionization of He is investigated using the hyperspherical R matrix with
semiclassical outgoing waves method. Triply, doubly, and singly differential, as well as fully …

The hyperspherical R-matrix method with semiclassical outgoing waves introduced by us
previously [Phys. Rev. A 60, 3667 (1999)] is applied to the one-photon double ionization of …