论文标题
聚焦原子束
Focusing of an Atomic Beam
论文作者
论文摘要
弯曲的晶体镜已被用来聚焦原子氦束。镜子是由沉积在云母基板上的金制成的，形成了大型单晶结构域的薄膜（〜5000Å厚）（域大小〜4000Å）。然后，云母板原位弯曲，形成曲率半径半径的圆柱镜。散射的束强度和角度分布的测量随曲率的函数表明，表现出极好的聚焦到表面的镶嵌物扩散内。室温镜的反射率约为百分之十。讨论了潜在用途，从氦散射实验的强度和分辨率增强的直接应用到诸如横梁过度冷却或扫描原子显微镜的过度冷却之类的长期可能性。
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.
