标题： 快速离子在表面驻波场中的能量损失与能散 显示英文标题

标题： Fast Ion Surface Energy Loss and Straggling in the Surface Wake Fields

摘要： 我们测量了快速且高度电离的原子穿过由金属和绝缘材料组成的薄双层靶时的能量损失和散射。 我们惊讶地发现，能量损失以及散射不仅依赖于靶的排列顺序，在双层反转时具有较小但显著不同的值。 我们认为这种新发现的能量损失差异是由表面能量损失场效应引起的，这是由于在两种情况下束流离开靶时产生的不同表面驻波场所致。 这一发现通过使用多种不同弹丸、速度和双层靶的实验得到了验证。 双原子分子离子的两个组成部分也显示出了类似的结果。 与固体中快离子表面驻波势的先前理论预测相比，能量损失结果的比较支持自驻波的存在。 显示英文摘要

摘要： We have measured the stopping powers and straggling of fast, highly ionized atoms passing through thin bilayer targets made up of metals and insulators. We were surprised to find that the energy losses as well as the straggling depend on the ordering of the target and have small but significantly different values on bilayer reversal. We ascribe this newly found difference in energy loss to the surface energy loss field effect due to the differing surface wake fields as the beam exits the target in the two cases. This finding is validated with experiments using several different projectiles, velocities, and bilayer targets. Both partners of the diatomic molecular ions also display similar results. A comparison of the energy loss results with those of previous theoretical predictions for the surface wake potential for fast ions in solids supports the existence of a self-wake.