Ionization of Atomic Hydrogen and Helium by Low Energy Antiprotons

碰撞过程是基本带电粒子电离简单原子和分子的过程，碰撞过程的实验研究为我们理解多体相互作用提供了必要的数据，并为碰撞动力学中这个基本但尚未解决的问题提供了理论描述。电离过程在天体物理和技术等离子体以及地球大气层中分子的解离中发挥着重要作用。通过比较等速质子、电子及其对应的反质子和正电子反粒子对简单原子和分子靶单电离和多次电离的影响，可以确定入射质量和电荷的影响。在反质子与轻原子碰撞的特殊情况下，可以研究“纯”电离与电子俘获或转移电离过程的分离。没有电子转移是一个显著的简化，而且弹丸的质量使得可以使用直线轨迹模型。

Experimental studies of collision processes, in which fundamental charged particles ionize simple atoms and molecules, provide the data necessary for our understanding of the many-body interaction and the development a theoretical description of this fundamental yet unsolved problem in collision dynamics. The ionization process plays an important role in astrophysical and technological plasmas and in the dissociation of molecules in the Earth's atmosphere. A comparison of single and multiple ionization of simple atomic and molecular targets by equi-velocity protons, electrons and their corresponding antiproton and positron antiparticles makes it possible to determine the effects of projectile mass and charge.The separation of 'pure' ionization from electron capture or transfer ionization processes can be studied in the special case of antiprotons colliding with light atoms. The absence of electron transfer is a significant simplification and the mass of the projectile enables straight-line trajectories models to be used.