多电离态是近玻尔速度高电荷态离子与固体作用时特殊内壳层过程的重要物理现象，相关研究是极端条件下原子物理过程的重要前言和热点课题。但是，由于离子能量特殊，作用过程极为复杂，相关理论模型不够完善，实验研究也比较少。本项目将利用中科院近物所320kV高电荷态离子研究平台提供的近玻尔速度Arq+离子作用于固体靶，联合使用高分辨的晶体谱仪与高效率的Si漂移X射线探测器，对Ar的Kα X射线精细谱和相关X射线发射截面进行符合测量，研究入射离子电荷态、能量以及靶参数对Ar产生多电离态的影响，探索多电离态的产生机制，完善现有理论模型，为高电荷态离子与原子碰撞的动力学过程和相关应用研究提供重要数据支持和实验依据。课题组成员相关研究经验丰富，具有前期实验基础，通过频移分析已观察到多电离；依托单位提供的离子束，流强稳定，电荷态大范围可调，离子速度也能满足玻尔速度附近这一特殊要求，有望通过系统研究取得重要进展。

Multiple-ionization state is the special phenomena during the inner-shell process induced by the interaction of highly charged heavy ions with solid target near the energy range of Bohr velocity. The relative researches of such process have been a hot topic for the atomic physics under extreme conditions. However，owing to the characteristic energy, the processes are very complicated. Until now, no theory can perfectly describe the mechanism, and the experimental work is also scarce. In this project, the experiment of Arq+ ions impacting on solid target near the Bohr velocity will be presented at the at the 320 kV high voltage experimental platform at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS). The high-resolution X-ray spectroscopies of Ar Kα X-ray and the relative X-ray production cross section will be coincidence measured by combining a crystal companied and a silicon drift detector. The effect of initial charge state and incident energy of the projectile and the target characteristic on the multiple ionization state of Ar ions will be discussed. The mechanism of multiple ionization state will be investigated. The project is in hopes of refining the present theoretical model and providing basic data and experimental support for the investigation of application and of dynamic mechanism for highly charged ion-atom interaction. The researchers involved in the project are quite experienced in the related experiments. The multiple-ionization has been found in The previous experiment by analyzing the shift of X-ray energy. 320 kV platform can provide various stable heavy ion beams with a wide range of incident charge states and energy near Bohr velocity. All of these advantages will help us to make a big step in this area.