Excitation mechanisms in K⁺–Ar and Cs⁺–Ar collisions at moderate laboratory energies E_lab = 0.05–2 keV are investigated by calculating repulsive potentials V(R) = 0.01–1 keV at distances R = 0.8–10 au. To discuss electronic transitions through radial couplings, the potential crossing distances R_C and potential heights V(R_C) at the crossings are evaluated using a charge-overlap model. The crossing parameters reasonably interpreted specific one- and two-electron (1e and 2e) excitations observed in earlier collision experiments. For the K⁺–Ar collisions, the angular and energy dependences of the cross-sections for 1e charge transfer are reproduced satisfactorily via calculations using the model potentials. Direct K^+*(3p⁵4s) excitation observed with remarkable probabilities at low energies of E_lab < 350 eV is interpreted by assuming a transition from the 2e excited Ar^**(3p⁴4s²) state to the 1e excited K^+*(3p⁵4s) state. For the Cs⁺–Ar collisions at E_lab < 1 keV, exclusive 2e excitation into the Cs^**(5p⁵6s²) + Ar⁺ state is attributed to the large interaction energy V₁₂ at the crossing between the ground and 1e-excited states, as well as to the small energy V₂₃ between the 1e- and 2e-excited states.

中文翻译：

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电荷重叠对中能K + -Ar和Cs + -Ar碰撞中电子跃迁的影响

通过计算距离R = 0.8-10 au时的排斥势V（R）= 0.01-1 keV，研究了在中等实验室能量E _lab = 0.05-2 keV时K ⁺ -Ar和Cs ⁺ -Ar碰撞中的激励机制。为了讨论通过径向耦合的电子跃迁，使用电荷重叠模型评估了交叉处的潜在交叉距离R _C和潜在高度V（R _C）。交叉参数合理地解释了在较早的碰撞实验中观察到的特定的单电子和双电子（1e和2e）激发。对于K ⁺通过使用模型电势进行的计算，可以令人满意地重现–Ar碰撞，1e电荷转移截面的角度和能量依赖性。通过假设从2e激发的Ar ^**（3p ⁴ 4s ²）态到1e激发的K ^{+ *}的跃迁来解释在低的E _lab <350 eV能量下以显着概率观察到的直接K ^{+ *}（3p ⁵ 4s）激发^。（3p ⁵ 4s）状态。对于在E _lab <1 keV处的Cs ⁺ –Ar碰撞，将2e激发排斥为Cs ^**（5p ⁵ 6s ²）+ Ar⁺状态归因于在基态和1e激发态之间的交点处的大相互作用能V ₁₂，以及1e和2e激发态之间的小能量V ₂₃。