AI 中文总结
本研究通过L-MM俄歇-迈特纳电子能谱，测量了百keV质子与Ar^{3+/6+}离子和Ar靶碰撞的电子截面，结合理论模型揭示了碰撞中多重电离与电荷平衡的规律，证实低能Ar^{q+}-Ar碰撞存在平衡电荷态。
AI 中文摘要
我们报道了百keV质子与Ar^{3+/6+}离子和原子Ar靶碰撞后L-MM俄歇-迈特纳电子发射的能量及角分辨绝对截面测量结果。双微分截面谱显示出靶与 projectile（ projectile 指入射离子）俄歇-迈特纳衰变的不同贡献。入射离子发射的电子呈现出与预期相符的多普勒频移，测量的峰值能量与运动学计算结果高度吻合。能量积分截面显示，靶与入射离子在各自静止系中呈各向同性角分布。靶和入射离子发射的俄歇-迈特纳峰值能量与原子Ar的特征L-MM俄歇-迈特纳能量峰值存在显著差异。实验测量还辅以理论模型的开发，该模型用于计算中性及多重带电Ar原子中显著L-MM俄歇-迈特纳跃迁对应的跃迁概率。测量与计算谱的比较表明，约150 eV处的测量发射峰值源自Ar^{4+}离子的俄歇-迈特纳衰变。靶与入射离子的发射峰值能量相等，且与入射离子初始电荷态无关，这表明衰变发生在广泛的多重电离、电荷交换过程导致碰撞伙伴电荷态平衡之后。结果表明，碰撞诱导的电子重排会显著改变俄歇-迈特纳谱，并为低能Ar^{q+}-Ar碰撞中存在平衡的靶-入射离子电荷态提供了证据。
英文摘要
We report energy and angle resolved absolute cross section measurements for LMM Auger-Meitner electron emission following collisions of hundred keV protons and $\mathrm{Ar^{3+/6+}}$ ion with an atomic Ar target. The double differential cross section spectra show distinct contributions from target and projectile Auger-Meitner decay. The projectile emission exhibits the expected Doppler shift for various angles of electron emission, and the measured peak energies are in excellent agreement with kinematic calculations. The energy integrated cross sections show isotropic angular distribution for target and projectile species in their respective rest frames. The Auger-Meitner peak energy for target as well as projectile emission show significant difference in comparison to the characteristic L-MM Auger-Meitner energy peak from atomic Ar. The experimental measurements have been complimented with development of a theoretical model to calculate the transition probabilities corresponding to prominent L-MM Auger-Meitner transitions in neutral and multiply charged Ar atom. Comparison between measured and calculated spectra shows that the measured emission peak at approximately 150 eV originates from Auger-Meitner decay of $\mathrm{Ar^{4+}}$ ions. The peak energies for target and projectile emission are found to be equal, independent of the initial projectile charge state. This indicates that the decay occurs following extensive multiple ionization, charge exchange processes resulting in charge-state equilibration of the collision partners. The results demonstrate that collision-induced electronic rearrangement strongly modifies the Auger-Meitner spectra and provide evidence for an equilibrium target-projectile charge state in low-energy $\mathrm{Ar^{q+} - Ar}$ collisions.
Comments10 Pages, 7 Figures, 3 Tables
