Benchmark Experiment to Prove the Role of Projectile Excited States Upon the Ion Stopping in Plasmas.
Benchmark Experiment to Prove the Role of Projectile Excited States Upon the Ion Stopping in Plasmas.
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DOI：
10.1103/physrevlett.126.115001
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发表时间：
2021-03
影响因子：
8.6
通讯作者：
Y. T. Zhao-Y. T.-Zhao-2124209673;Y. N. Zhang-Y. N.-Zhang-2124817772;R. Cheng;B. He;C. L. Liu-C. L.-Liu-2124125331;X. M. Zhou-X. M.-Zhou-2124052534;Y. Lei;Y. Y. Wang-Y. ;J. Ren;X. Wang;Y. H. Chen-Y. H.-Chen-2124915851;G. Xiao;S. Savin;R. Gavrilin;A. Golubev;D. Hoffmann
中科院分区：
文献类型：
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作者：
Y. T. Zhao-Y. T.-Zhao-2124209673;Y. N. Zhang-Y. N.-Zhang-2124817772;R. Cheng;B. He;C. L. Liu-C. L.-Liu-2124125331;X. M. Zhou-X. M.-Zhou-2124052534;Y. Lei;Y. Y. Wang-Y. ;J. Ren;X. Wang;Y. H. Chen-Y. H.-Chen-2124915851;G. Xiao;S. Savin;R. Gavrilin;A. Golubev;D. Hoffmann
本文报道了100 keV/u氦离子在氢放电等离子体中能量损失的精确测量和理论研究。氦离子与质子、自由电子和氢原子的碰撞过程非常适合于对等离子体停止功率模型进行基准测试。我们的实验结果的能量损失显着高于传统的有效电荷模型的预测。我们得到了很好的协议与我们的数据通过求解速率方程，其中除了基态，也被认为是激发电子配置的抛射离子。因此，我们表明，激发的抛射态，碰撞，导致捕获，电离和辐射衰减过程中，在等离子体中的停止过程中发挥了重要作用。
We report on a precision energy loss measurement and theoretical investigation of 100 keV/u helium ions in a hydrogen-discharge plasma. Collision processes of helium ions with protons, free electrons, and hydrogen atoms are ideally suited for benchmarking plasma stopping-power models. Energy loss results of our experiments are significantly higher than the predictions of traditional effective charge models. We obtained good agreement with our data by solving rate equations, where in addition to the ground state, also excited electronic configurations were considered for the projectile ions. Hence, we demonstrate that excited projectile states, resulting from collisions, leading to capture-, ionization-, and radiative-decay processes, play an important role in the stopping process in plasma.