He原子束在粗糙表面的量子阈值反射
Quantum threshold reflection of He atom beams from rough surfaces
摘要：
在弹性紧耦合理论框架内，研究了热氦原子在掠入射条件下从不同表面（载玻片、GaAs晶片、平面和结构化铬）的量子反射。与B.S. Zhao等人，Phys. Rev. Lett. { \bf 105}，133203（2010）是相当合理的，但是目前理论分析的结论与实验工作中讨论的那些不同。在垂直于表面的入射波矢量分量上的反射概率的依赖性中观察到的普遍线性行为仅在分量的小值处有效，而在较大值处，偏离线性是明显的，在较高值处接近二次依赖性。表面粗糙度似乎没有发挥重要作用，在这种散射。此外，声称观察到从量子反射到经典反射的转变似乎是不精确的。
英文摘要：
Quantum reflection of thermal He atoms from various surfaces (glass slide, GaAs wafer, flat and structured Cr) at grazing conditions is studied within the elastic close-coupling formalism. Comparison with the experimental results of B.S. Zhao et al, Phys. Rev. Lett. {\bf 105}, 133203 (2010) is quite reasonable but the conclusions of the present theoretical analysis are different from those discussed in the experimental work. The universal linear behavior observed in the dependence of the reflection probability on the incident wave vector component perpendicular to the surface is only valid at small values of the component whereas, at larger values, deviation from the linearity is evident, approaching a quadratic dependence at higher values. The surface roughness seems to play no important role in this scattering. Moreover, the claim that one observes a transition from quantum to classical reflection seems to be imprecise.
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