Elastic Scattering of Electrons from Na-like Ions

Abstract

Differential cross sections for elastic scattering of electrons from Al²⁺ and Ar⁷⁺ are calculated with the R-matrix method. Using six different sets of coupled states, the convergence is tested against the number of coupled states in the calculation. The converged cross section is analysed in terms of the contributions of the long-range Coulomb force, the short-range electrostatic interaction and the interference of those two. A comparison with the recent measurement at 100 eV for Ar⁷⁺ shows disagreement in the vicinity of a scattering angle of 50°.