Repulsive potentials for Na+–R and Al+–R (R= rare gas atoms) derived from beam experiments

Abstract

Repulsive potentials for Na⁺–R and Al⁺–R (R=rare gas atoms) are derived from integral scattering experiments using the projectile ions in the energy range 0.5–4 keV. The potentials are well represented by an exponential formula, V (R) =A exp(−αR). The numerical values of the parameters, A (eV) and α (Å⁻¹), are Na⁺–He, 1200, 4.92; Na⁺–Ne, 5350, 5.12; Na⁺–Ar, 11 340, 4.68; Na⁺–Kr, 9600, 4.33; Al⁺–He, 325, 3.50; Al⁺–Ne, 1220, 3.93; and Al⁺–Ar, 3170, 3.86. The statistical computation published by Kim and Gordon [J. Chem. Phys. 60, 4323 (1974)] for Na⁺–R is in good agreement with the experiments, and the values for Al⁺–He and Al⁺–Ar computed by a similar statistical method are also in good agreement with the experimental results, while Al⁺–Ne resulted in a significant discrepancy.