Three-body treatment of the Z-dependence for excitation cross sections in Aq+ + H (1s) collisions — Excitation from the ground to the 2s and 3s states

Abstract

A three-body Faddeev type formalism is applied to calculate the total excitation cross sections in the collision of a bare ion, A q +(1 ≤ q ≤ 4), with atomic hydrogen, leading to the excitation of its 2s and 3s states. These calculations were undertaken at energies in the range 1 MeV−7 MeV. The first order electronic and nuclear amplitudes are included in the model, in order to calculate the differential and total excitation cross sections leading to the first order form factors. The present results are compared with the available data in the literature, specifically those from monocentric close-coupling calculations. The Z-dependence of the 2s and 3s excitation cross sections are also determined, and compared with corresponding data available in the literature. Saturation is observable in the excitation cross sections in the 1−7 MeV energy region, which depends on the ratio of projectile’s and target’s nuclear charge.