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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >DEFOCUSSED TEM CONTRAST FROM SMALL HELIUM BUBBLES IN COPPER
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DEFOCUSSED TEM CONTRAST FROM SMALL HELIUM BUBBLES IN COPPER

机译：铜中小氦泡去除的TEM对比度

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摘要

The theoretical defocussed contrast of the TEM images of bubbles is computed using simulations based on the two-beam dynamical theory of electron diffraction. The bubble parameters used are chosen to be typical of the small (similar to 2 nm in diameter) bubbles found in gas-bubble superlattices. Simulated images are calculated for single equilibrium bubbles, for isolated columns of equilibrium bubbles and for single overpressured bubbles in copper. The calculated images are found to depend strongly on many parameters: the depth, pressure and radius of bubbles; foil thickness; diffracting vector; excitation error; defocus level, small deviations from the Bragg angle and number of bubbles included in the column. Representative examples are presented and comparisons made with experiment. It is concluded that simulations provide a very useful framework for guiding the broad choice of imaging parameters and provide a basis for the interpretation of the complicated imaging behavior often encountered in practice. Various methods for measuring bubble radii from TEM micrographs are assessed. (C) 1997 Elsevier Science B.V. [References: 38]
机译：气泡的TEM图像的理论散焦对比度是根据基于电子衍射的两束动力学理论的模拟计算得出的。选择使用的气泡参数是气泡超晶格中典型的小气泡（直径约2 nm）的典型参数。针对单个平衡气泡，平衡气泡的孤立列以及铜中的单个超压气泡计算模拟图像。发现计算出的图像很大程度上取决于许多参数：气泡的深度，压力和半径;以及箔厚度衍射矢量励磁误差散焦水平，与布拉格角的微小偏差以及色谱柱中包含的气泡数。给出了代表性的例子，并与实验进行了比较。结论是，模拟为指导广泛的成像参数选择提供了非常有用的框架，并为解释实践中经常遇到的复杂成像行为提供了基础。评估了从TEM显微照片测量气泡半径的各种方法。 （C）1997 Elsevier Science B.V. [参考：38]

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