Strongly perturbed state-selective charge exchange between slow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Ar</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>and He
R. T. Zhang, J. W. Gao, Y. W. Zhang, Dalong Guo, Yuan Gao, Xiaolong Zhu, Jiawei Xu, Dongmei Zhao, Sen Yan, Shenyue Xu, S. F. Zhang, Yong Wu, J. G. Wang, X. Ma
Abstract
We report an experimental and theoretical study of state-selective charge exchange processes in ${\mathrm{Ar}}^{8+}$ on He collisions at 1 and 3 keV/amu, benchmarking the fundamental electron capture dynamics under strong perturbations. The quantum-state selectivity has been experimentally resolved for one $1s$ electron of He capture into $4s$, $4p$, $4d+4f$, and $5s$ states of ${\mathrm{Ar}}^{7+}$ ion along with the corresponding scattering angle differential cross sections. By comparing to theoretical calculations with a two-active-electron semiclassical asymptotic-state close-coupling approach, we are able to verify the important role of electronic correlations during the collisions and that the impact parameter sensitive transition probability significantly mediates the state-selective specifics.