Sakhelashvili G, Dorn A, Höhr C, Ullrich J, Kheifets A S, Lower J, Bartschat K
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Phys Rev Lett. 2005 Jul 15;95(3):033201. doi: 10.1103/PhysRevLett.95.033201. Epub 2005 Jul 14.
Simultaneous ionization and excitation of helium atoms by 500 eV electron impact is observed by a triple coincidence of an ionized slow electron, the recoiling He+ ion, and the radiated vacuum ultraviolet photon (lambda< or =30.4 nm). Kinematically complete differential cross sections are presented for the He+(2p)2P final ionic state, demonstrating the feasibility of a quantum mechanically complete experiment. The experimental data are compared to predictions from state-of-the-art numerical calculations. For large momentum transfers, a first-order treatment of the projectile-target interaction can reproduce the experimental angular dependence, but a second-order treatment is required to obtain consistent magnitudes.
通过对电离的慢电子、反冲的He⁺离子和辐射的真空紫外光子（波长≤30.4 nm）进行三重符合测量，观测到500 eV电子碰撞使氦原子同时发生电离和激发。给出了He⁺(2p)²P末态离子的运动学完全微分截面，证明了量子力学完全实验的可行性。将实验数据与最新数值计算的预测结果进行了比较。对于大动量转移，对入射粒子 - 靶相互作用的一阶处理可以再现实验角度依赖性，但需要二阶处理才能获得一致的量级。
