Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, (p)over-bar- Ar, and He2+-Ar collisions
Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, (p)over-bar- Ar, and He2+-Ar collisions
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DOI：
10.1103/physreva.66.052719
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发表时间：
2002-11
影响因子：
2.9
通讯作者：
T. Kirchner;M. Horbatsch;H. Ludde
中科院分区：
文献类型：
--
作者：
T. Kirchner;M. Horbatsch;H. Ludde
在质子，反质子，和He{sup 2+}-离子对氖的影响的多电子跃迁上的先前的工作扩展到碰撞能量在5-1000 keV/amu范围内的氩靶的情况下。使用球对称优化的有效靶原子势与动态屏蔽效应的基础上随时间变化的净电离概率的实验误差内预测的全球数量，如从目标，净捕获，净电离的净电子损失。为了获得净电离截面中峰的正确位置和高度，包含目标响应是至关重要的。由于级联后的多个外壳激发的影响被认为是可观的能量在10和100千电子伏/安培，但高估的统计模型。据报道，L-壳层空位的产生会影响反冲电荷态的产生，其能量高于200 keV/amu，电荷态q{>=}3。在低和中等能量，独立粒子模型被证明高估q-倍反冲离子生产显着为q{>=}3的质子撞击信号的作用，这些通道的电子相关性。对于反质子碰撞，q=3截面与独立粒子模型一致。
Previous work on multielectron transitions in proton, antiproton, and He{sup 2+}-ion impact on neon is extended to the case of argon targets for collision energies in the 5-1000 keV/amu range. Global quantities such as net electron loss from the target, net capture, and net ionization are predicted within experimental errors using a spherically symmetric optimized effective target atom potential with dynamical screening effects based on the time-dependent net ionization probability. The inclusion of target response is crucial in order to obtain correct positions and heights for the peaks in the net ionization cross sections. Effects due to cascading following multiple outer-shell excitation are found to be appreciable at energies between 10 and 100 keV/amu, but are overestimated by the statistical model. L-shell vacancy production is reported to affect recoil charge state production at energies above 200 keV/amu for charge states q{>=}3. At low and intermediate energies, the independent-particle model is shown to overestimate q-fold recoil ion production significantly for q{>=}3 for proton impact signaling the role of electronic correlations for these channels. For antiproton impact the q=3 cross section is consistent with the independent-particle model.