X射线荧光全息术中入射能量对原子像的影响

X射线荧光全息术是一种新型的显微成像技术，它能在原子水平上直接观察到晶体内部的三维结构。然而它所得到的原子像存在明显的孪生像现象。因此，采用多重能量的全息记录来消除孪生像。分别以单个和多个铁原子为模型，数值模拟了它们在4π立体角范围内、不同范围的入射能量的情况下记录的全息图。比较由这些全息图重构得到的原子像，发现入射能量范围越宽，其消除孪生像的效果越好，而且随着入射能量的提高，其原子像的分辨力也越高。

Influence of Incident Energy on Reconstructed Atomic Images in X-Ray Fluorescence Holography

X-ray fluorescence holography is a novel microscopic imaging method, which can provide the information of three-dimensional atomic arrangement in a single crystal. However, obvious twin images apperar on the cetomic images dotained by this method. Therefore, the method called “multiple-energy X-ray hologrophy” that images reconstructed from holograms recorded at several incident energies are combined properly is used to remove the twin images. In this work, a single Fe atom and multi Fe atoms as model respectively, holograms recorded in a complete 4π solid angle with different range and magnitude of incident energies are calculated. Compared reconstructed atomic images from these holograms, it is found that the wider range of incident energies, the better effect of removing twin images is. Moreover, the difference between simulated peak positions and actual atomic positions decreases and the resolution of reconstructed atomic images increases with increasing incident energy.