Single ionization of He by two oppositely circularly polarized, time-delayed attosecond
pulses is shown to produce photoelectron momentum distributions in the polarization plane …

Multistart spiral vortex patterns are predicted for the electron momentum distributions in the
polarization plane following ionization of the helium atom by two time-delayed circularly …

We investigate ionization of atomic hydrogen by electron-and positron-impact. We apply the
Coulomb–Born (CB1) approximation, various modified CB1 approximations, the three body …

Using the two-channel Kohn and inverse Kohn variational methods, we investigate ground-
state positronium (Ps) formation in positron-hydrogen collisions in the Ore gap. We find two …

Vortices are an inherent property of the velocity fields of complex, time-dependent,
Schrödinger wave functions ψ occurring where both the real and the imaginary parts of ψ …

We review the concept of quantum vortices and their appearance in ionization collisions. By
relaxing the usual geometrical restrictions on the momenta of the final-state, we study these …

This study investigates how the presence of quantum vortices affects the ionization cross-
section of helium atoms by 75 keV proton impact, with special attention to the region near …

Previously, a deep minimum in the measurements of the triply differential cross section
(TDCS) for electron-helium ionization at an incident energy of 64.6 eV was interpreted in …

By means of a systematic theoretical study of the transition matrix element T for the
${{e}^{+}}+{\rm H} $ ionization collisions in a collinear geometry, we uncover the presence of …

Vortices are structures known in our daily lives and observed in a wide variety of systems,
from cosmic to microscopic scales. Relatively recent studies showed that vortices could also …