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首页> 外文期刊>Ultramicroscopy >The effect of mechanical vibration and drift on the reconstruction of exit waves from a through focus series of HREM images
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The effect of mechanical vibration and drift on the reconstruction of exit waves from a through focus series of HREM images

机译：机械振动和漂移对HREM图像通过焦点系列的出射波重构的影响

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Experimental HREM images can show a limitedresolution as a mechanical vibration and drift. In this paper theeffect of such mechanical vibrations on the accuracy of thethrough focus exit wave reconstruction method is investigated fordifferent thicknesses of a test structure of La_3Ni_2B_2N_3. Athrough-focus series of HREM images for this structure issimulated for different kinds of mechanical vibrationcorresponding to an information limit g of about 7 nm~ (-1): (1)no mechanical vibration, (2) isotropic mechanical vibration, and (3)several anisotropic mechanical vibrations. From these through-focus series the reconstructed exit wave is calculated(Ultramicroscopy 64 (1996)109). The above isotropic andanisotropic mechanical vibrations have a large effect on thereconstructed exit waves when compared with the reconstructedexit wave without mechanical vibration, i.e. the range ofamplitudes and phases in a reconstructed exit wave decreases andthe background intensity increases. The initial thickness andorientation can be obtained using a least-squares refinementprocedure (Acta Crystallogr. A 54(1998) 91) when there is nomechanical vibration present. In the case of isotropic oranisotropic vibration, the refined thickness and orientation arelikely to give wrong results depending on the size of the vibrationsand on the number of significant reflections (which is related tothe size of the unit cell, the thickness and the misorientation).
机译：实验性HREM图像可以显示出有限的分辨率，例如机械振动和漂移。针对La_3Ni_2B_2N_3测试结构的不同厚度，研究了这种机械振动对直焦点聚焦波重构方法精度的影响。针对与大约7 nm〜的信息极限g相对应的不同类型的机械振动，模拟了此结构的贯穿焦点的HREM图像：（1）无机械振动，（2）各向同性机械振动，以及（3）几个各向异性的机械振动。从这些贯穿焦点的序列中，计算出重构的出射波（Ultramicroscopy 64（1996）109）。与没有机械振动的重建出射波相比，上述各向同性和各向异性的机械振动对重建的出射波影响较大，即重建出射波的振幅和相位范围减小，背景强度增大。当不存在机械振动时，可以使用最小二乘法精修过程（Acta Crystallogr。A 54（1998）91）获得初始厚度和方向。在各向同性各向异性振动的情况下，取决于振动的大小和有效反射的次数（与晶胞的大小，厚度和取向错误有关），精确的厚度和方向可能会给出错误的结果。

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