量子多体动力学尤其电子-电子关联效应是量子力学中最基本的问题之一，同时也是解决物理、化学、生物和材料等不同领域许多科学与技术问题的关键因素。电子与原子分子碰撞电离过程是研究量子多体关联动力学的重要手段之一，在物理学及其交叉学科的多个领域有着广泛的基础研究和应用价值。目前，在氦原子双电离（e，3e）这一基本的量子四体问题研究方面，已有的实验主要局限于共面几何条件下的相对截面测量，并且关于高阶关联效应的贡献及物理机制存在一定的争论。本项目研究拟基于纵向反应谱仪技术实现氦原子双电离三维动力学完全实验研究，利用反应谱仪高探测效率和覆盖4pi立体角多粒子符合测量的优势，从根本上解决实验存在的上述问题。实验测量不同动力学条件下交叉归一的三维空间全微分散射截面，同时获得共面和非共面几何条件下的实验数据，聚焦和理解高阶关联效应的影响，深入研究氦原子体系中的电子关联效应和最基本的量子四体问题。

Quantum many-body dynamic, in particular electron correlation, is one of the most basic problems in quantum mechanics which is relevant to understand and interpret a wide range of scientific phenomenon and technological applications. One of the most basic ways to learn about many-body interactions in atom or molecule is to break it apart, such as the experiment of electron-impact ionization. In double ionization of Helium also called (e, 3e) reaction, the existing data of (e, 3e) on Helium are limited in the coplanar geometry with relative cross sections. In the present project we aim to explore the dynamics of electron-impact double ionization of Helium by kinematically complete measurements. The experiments are performed using reaction microscope or COLTRIMS techniques in which the momentum vectors and consequently, the kinetic energies of final state electrons and ions are coincidentally measured by covering almost 4pi solid angles. Therefore, benchmark data with highly improved statistics, cross-normalized and three-dimensional (3D) fully-differential cross sections will be obtained in the present project. This will provide a comprehensive study on the process of (e, 3e) on Helium for understanding the role of electron correlation and the dynamics of the most basic quantum four-body problem.