Repulsive potentials for Cl−–R and Br−–R (R=He, Ne, and Ar) derived from beam experiments

Abstract

Repulsive potentials for Cl⁻–R and Br⁻–R (R=He, Ne, and Ar) have been derived from the experimental values of integral scattering cross sections of the ions in the energy range 0.5–4 keV. The potentials are well represented by an exponential form, V (R) =A exp(−αR). The numerical values of the parameters, A (eV) and α (Å⁻¹), are as follows: Cl⁻–He, 255, 2.88; Cl⁻–Ne, 820, 3.05; Cl⁻–Ar, 1470, 3.01; Br⁻–He, 365, 2.92; Br⁻–Ne, 985, 3.05; and Br⁻–Ar, 1420, 2.83. The potential parameters are found to be closely related to the electronic charge distributions in the colliding pairs on the assumption of overlapping of the electron clouds.