He原子撞击Ag（110）表面的掠入射快原子衍射
Grazing incidence fast atom diffraction for He atoms impinging on a Ag(110) surface
摘要：
利用快氦原子在Ag（110）表面掠散射产生的实验衍射图样作为灵敏工具，对散射模型和势模型进行了检验。为了描述弹性碰撞过程，我们采用表面程函（SE）近似，这是一种半经典的方法，包括来自不同的投射路径的贡献之间的量子干涉。弹丸表面势是从一个精确的密度泛函理论（DFT）计算，考虑到入射弹丸的三个自由度。理论和实验之间的动量分布的一个相当好的协议被发现沿不同的低指数结晶方向的入射。
英文摘要：
Experimental diffraction patterns produced by grazing scattering of fast helium atoms from a Ag(110) surface are used as a sensitive tool to test both the scattering and the potential models. To describe the elastic collision process we employ the surface eikonal (SE) approximation, which is a semi-classical method that includes the quantum interference between contributions coming from different projectile paths. The projectile-surface potential is derived from an accurate density-functional theory (DFT) calculation that takes into account the three degrees of freedom of the incident projectile. A fairly good agreement between theoretical and experimental momentum distributions is found for incidence along different low-indexed crystallographic directions.
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