Inelastic processes in atomic collisions are far from being fully understood, in spite of the several efforts made from experimental and theoretical researchers along the last decades. In particular, the description of charge exchange processes still represents a challenging scenario when highly charged projectiles are considered, even when their probability outcomes are of great interest in fusion devices nowadays[1]. In this context, this problem has been tackled in recent years from different theoretical perspectives, which include both quantum and classical numerical methods [2, 3].
In this talk we present a projectile charge dependence study of state-selective charge exchange cross-sections following the collision of fully stripped ions with atomic hydrogen in its ground and first excited states. The projectile impact energy range spans from 1 keV/u to 500 keV/u. Calculations are carried out by means of classical trajectory models, which are based on microcanonical and hydrogenic initializations for the target electron. For H(1s), our results are contrasted to the data reported within the AOCC, TC-AOCC and WP-CCC quantum mechanical methods, where available, while, for H*(n=2), we compare our results to those provided by the AOCC model.
Results here shown analyse a broad range of projectile charges and impact energies, allowing for a critical insight on the similarities and differences of the cross-sections predicted by the different models across different collisional regimes.
[1] P. Beiersdorfer. J. Phys. B: At. Mol. Opt. Phys. 48, 144017 (2015).
[2] A. M. Kotian, C. T. Plowman, I. B. Abdurakhmanov, I. Bray and A. S. Kadyrov. J. Phys. B: At. Mol. Opt. Phys. 55 115201 (2022).

[3] N. D. Cariatore, N. Bachi, E. Acebal and S. Otranto. Plasma Physics and Controlled Fusion 67, 55003 (2025).

Work at IFISUR was supported by Grant No. PGI 24/F084 (UNS), Argentina. This research was conducted under the Coordinated Research Project, code F43026, of the IAEA, Austria.