Grazing-incidence scattering of coherent X-rays from a liquid surface.

Grazing-incidence scattering of coherent X-rays from a liquid surface.
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来自液体表面的相干 X 射线的掠入射散射。

DOI:
10.1107/s0909049505022065
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发表时间:
2005
影响因子:
2.5
通讯作者:
G. Grübel
G. Grübel
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
A. Madsen;T. Seydel;M. Tolan;G. Grübel

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由相干X射线产生的散射图像看起来是颗粒状的,并且被表示为散斑图案。本文分析了部分相干同步辐射光束在液体表面散射产生的散斑图的静态特性和随时间变化的特性。通过在掠入射角下应用X射线来实现独特的表面灵敏度。观察到的对比度的散斑图案取决于平行于表面的动量转移,不像透射小角X射线散射(SAXS)的情况下,基本上没有q依赖性的对比度已被观察到。斑点的出现和图像的对比度可以通过使用几何参数和液体表面非常平坦的事实来定性地理解。
The scattering image produced by coherent X-rays appears grainy and is denoted a speckle pattern. An analysis of the static and time-dependent properties of a speckle pattern generated by scattering of a partially coherent synchrotron beam from a liquid surface is given here. Unique surface sensitivity is achieved by applying the X-rays under a grazing angle of incidence. The observed contrast of the speckle pattern depends on the momentum transfer parallel to the surface, unlike the case of transmission small-angle X-ray scattering (SAXS), where essentially no q-dependence of the contrast has been observed. The appearance of the speckles and the contrast of the image can be understood qualitatively by use of geometrical arguments and by the fact that liquid surfaces are extremely flat.
A. Fajar 等人:“近晶-A-近晶-C_α^* 相变附近波动引起的克尔效应”分子晶体和液晶。
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