Grating-based holographic X-ray diffraction: theory and application to confined fluids
Grating-based holographic X-ray diffraction: theory and application to confined fluids
复制标题
基于光栅的全息 X 射线衍射：受限流体的理论与应用
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. V. D. Veen
中科院分区：
文献类型：
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作者：
K. Nyg̊ard;D. Satapathy;O. Bunk;E. Perret;J. Buitenhuis;C. David;J. V. D. Veen
基于光栅的全息 X 射线衍射技术已被开发出来，用于重建限制在通道阵列中的纳米级流体的密度分布。在这种方法中，参考波是由所制造的通道阵列的衍射产生的，而目标波是由流体的约束引起的有序化产生的。然后，通过直接傅立叶反演，根据参考波和目标波之间的干扰，以与模型无关的方式确定穿过限制通道的流体的系综平均密度分布（构成弱相对象）。详细讨论了线性全息方法的有效性及其与自相关函数的联系、通道锥度的包含以及体积衍射效应。
A grating-based holographic X-ray diffraction technique has been developed for reconstructing density profiles of nano-scale fluids confined in channel arrays. Within this approach, the reference wave is due to diffraction from the fabricated channel array, whereas the object wave is generated by the confinement-induced ordering of the fluid. The ensemble-averaged density profile of the fluid across the confining channel, which constitutes a weak phase object, is then determined in a model-independent manner from the interference between the reference and object waves by direct Fourier inversion. The validity of the linear holographic approach and its connection to the autocorrelation function, the inclusion of channel tapering, and volume-diffraction effects are discussed in detail.