原子束的聚焦

摘要：

一个单晶镜被用来聚焦氦原子束。反射镜由沉积在云母基底上的金制成，以形成大单晶畴（畴尺寸~4000 μ m）的薄膜（~5000 μ m厚）。然后将云母片原位弯曲以形成可变曲率半径的柱面镜。散射光束强度和角分布作为曲率的函数的测量证明了在表面的马赛克扩展内的优异聚焦。室温反射镜的反射率约为10%。讨论了潜在的用途，从氦散射实验的强度和分辨率增强的直接应用，到束流超冷或扫描原子显微镜的制造等长期可能性。

英文摘要：

A bent-crystal mirror has been used to focus an atomic helium beam. The mirror is made from gold deposited onto a mica substrate to form a thin film (~5000 Å thick) of large single crystal domains (domain size ~4000 Å ). The mica sheet is then bent in situ to form a cylindrical mirror of variable radius of curvature. Measurement of scattered beam intensity and angular distribution as a function of curvature demonstrate excellent focusing to within the mosaic spread of the surface. The reflectivity of the room temperature mirror is about ten percent. Potential uses are discussed, ranging from immediate applications in intensity and resolution enhancement of helium scattering experiments, to such long term possibilities as hyper-cooling of the beam or fabrication of a scanning atom microscope.

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