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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Contrast reversal in atomic-scale phonon spectroscopic imaging
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Contrast reversal in atomic-scale phonon spectroscopic imaging

机译：对比逆转原子级声子分光镜成像

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摘要

It was recently shown that phonon spectral mapping of atomic structure is possible in scanning transmission electron microscopy. These results were obtained by deflecting the transmitted beam to detect probe electrons that had been scattered through large momentum transfer into a detector centered at an angle more than twice the radius of the bright-field disk. Atomic-scale spectral maps are still obtained for electrons scattered to angles smaller than the probe convergence angle, albeit at lower contrast and despite the smaller momentum transfers associated with these electrons. It is reported here that apparent reversals of contrast can be observed for these smaller momentum transfers, which is not the case when imaging using probe electrons scattered through larger momentum transfers. This phenomenon can be explained in terms of the channeling of the incident probe. We discuss how such contrast reversals may be avoided and atomic resolution maps reliably obtained.
机译：最近表明，在扫描透射电子显微镜中可以进行原子结构的声子谱映射。通过使透射光束偏转以检测已经散射的探针电子传送到以大于明场盘的半径的两倍以上的角度散射到探测器中的探针电子来获得。对于散射到小于探针收敛角的电极的电子仍然获得原子尺度光谱图，尽管与这些电子相关的较小的动量转移，但是尽管较低的对比度，但是仍然被散射到小于探针收敛角的角度。这里据报道，对于这些较小的动量转移，可以观察到对比度的表观逆转，这是使用散射通过较大的动量转移的探针电子成像时的情况。这种现象可以根据事件探针的窜流来解释。我们讨论如何避免这种对比度逆转，并且可靠地获得原子分辨率映射。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214111.1-214111.9|共9页
  • 作者

    F. S. Hage; Q. M. Ramasse; L. J. Allen;

  • 作者单位

    SuperSTEM Laboratory SciTech Daresbury Campus Daresbury WA4 4AD Untied Kingdom Department of Materials University of Oxford Oxford OX1 3PH United Kingdom;

    SuperSTEM Laboratory SciTech Daresbury Campus Daresbury WA4 4AD Untied Kingdom School of Physics and Astronomy and School of Chemical and Process Engineering University of Leeds Leeds LS2 9JT United Kingdom;

    School of Physics University of Melbourne Parkville Victoria 3010 Australia;

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