弹性散射和非弹性散射的顺序是否会影响图像，或者非弹性散射是否会产生自上而下的效应？

IF 2.1 3区工程技术 Q2 MICROSCOPY

Ultramicroscopy Pub Date : 2023-12-14 DOI:10.1016/j.ultramic.2023.113890

Peter Rez

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引用次数: 0

摘要

特别是对于轻元素来说，非弹性散射比传递结构信息的弹性散射更有可能发生。由此产生的问题是，使用非弹性散射电子的图像是否会因弹性散射还是非弹性散射先发生而不同，是否存在上下效应。我们的研究表明，由于非弹性散射集中在较窄的角度范围内，远小于轻元素材料中典型的布拉格角，因此非弹性过程和弹性过程是可分离的，而且在很好的近似条件下，不存在上下效应。对于相物体的弱散射薄生物试样来说，分离是精确的，不可能存在顶底效应。

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Does the order of elastic and inelastic scattering affect an image or is there a top bottom effect from inelastic scattering?

Especially for light elements inelastic scattering is more probable than the elastic scattering that conveys the structural information. The question arises as to whether an image using inelastically scattered electrons is different depending on whether the elastic or inelastic scattering happens first, is there a top-bottom effect. We show that since inelastic scattering is concentrated in a narrow range of angles, much less than typical Bragg angles in light element materials, the inelastic and elastic processes are separable and, to a very good approximation, there is no top-bottom effect. For weakly scattering thin biological specimens that are phase objects the separation is exact and there can be no top-bottom effect.

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来源期刊

Ultramicroscopy 工程技术-显微镜技术

CiteScore

4.60

自引率

13.60%

发文量

117

审稿时长

5.3 months

期刊介绍： Ultramicroscopy is an established journal that provides a forum for the publication of original research papers, invited reviews and rapid communications. The scope of Ultramicroscopy is to describe advances in instrumentation, methods and theory related to all modes of microscopical imaging, diffraction and spectroscopy in the life and physical sciences.