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Differential convergent beam electron diffraction: Experiment and theory

机译：微分会聚束电子衍射：实验与理论

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摘要

The derivative of intensity with respect to scattering angle in an electron diffraction pattern is shown to be almost completely independent of whether the pattern has been energy filtered or not. This is attributed to the diffuse nature of inelastic scattering. A simple approach to quantitative convergent beam electron diffraction (QCBED), developed on this basis and tested on a corresponding pair of energy-filtered and unfiltered diffraction patterns from α-Al_2O_3, produces a fit between experimental and theoretical differential CBED patterns that is well within experimental uncertainty. Structure factors measured from the unfiltered data are indistinguishable from those from the filtered data. Furthermore, those measurements made by angular-difference QCBED appear to be less influenced by parameter correlation and the inelastic components of CBED patterns than those made by conventional QCBED. The outcome is a new avenue for accurate charge density studies that does not depend on energy-filtering optics or acquisition of multiple patterns requiring translation of the specimen.
机译：电子衍射图形中强度相对于散射角的导数显示出几乎完全与图形是否经过能量滤波无关。这归因于非弹性散射的扩散性质。在此基础上开发出了一种简单的定量会聚束电子衍射（QCBED）方法，并在相应的一对α-Al_2O_3能量过滤和未过滤衍射图上进行了测试，从而在实验和理论差分CBED图之间产生了契合实验不确定性。从未经过滤的数据测量的结构因子与从过滤的数据的结构因子无法区分。此外，与常规QCBED相比，通过角差QCBED进行的那些测量似乎受参数相关性和CBED图案的非弹性成分的影响较小。结果是进行精确电荷密度研究的新途径，该途径不依赖于能量过滤光学器件或获取需要平移样品的多个图案。

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  • 来源
    《Physical review》 |2010年第11期|p.115135.1-115135.10|共10页
  • 作者

    Philip N. H. Nakashima; Barrington C. Muddle;

  • 作者单位

    ARC Centre of Excellence for Design in Light Metals and Department of Materials Engineering, Monash University,Victoria 3800, Australia;

    rnARC Centre of Excellence for Design in Light Metals and Department of Materials Engineering, Monash University,Victoria 3800, Australia;

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