Total and differential cross sections for positron and electron impact on
argon atoms are compared in order to show their similarities and differences. These
comparisons provide information as to how antimatter-matter atomic interactions are
like, or different from, matter-matter interactions that are normally encountered. Plus
such comparisons provide information about how simply changing the direction of the
coulomb field in atomic interactions influences the interaction probabilities and the
kinematics. Data taken from the literature are used for these comparisons. The selected
data are considered to be the most reliable available and representative of the many
studies performed to date.
Keywords: Antimatter, Atomic collisions. Positron impact, Charge effects,
Coulomb interaction, Differential cross sections, Elastic collisions, Electron
impact, Electron correlation, Ionization, Inelastic collisions, Shake-off, TS-1.