We have measured fully momentum-analyzed recoiling target ions and scattered projectiles, produced in ionization of He and ${\mathrm{H}}_2$ by 75 keV proton impact, in coincidence. The momentum of the ejected electrons was deduced from momentum conservation. From the data we extracted fully differential ionization cross sections as a function of the polar electron emission angle (for fixed electron energies) and as a function of the electron energy (for fixed electron emission angles). Comparison between experiment and various distorted wave calculations confirms that under kinematic conditions where the post-collision interaction plays an important role, the few-body dynamics underlying the ionization process are still poorly understood.

中文翻译：

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中速质子与He和H2碰撞中全差分电离截面的射出电子能量和角度依赖性

我们已经测量了经过全动量分析的反冲目标离子和散射的氦气和氦气电离产生的弹丸 ${\mathrm{H}}_2$碰巧受到75 keV质子的冲击 从动量守恒推导出电子的动量。从数据中，我们提取出完全微分的电离截面，这些截面是极性电子发射角的函数（对于固定的电子能量）和电子能量的函数（对于固定的电子发射角）。实验与各种畸变波计算之间的比较证实，在碰撞后相互作用起重要作用的运动学条件下，对电离过程背后的少数人体动力学仍然知之甚少。