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cherry丹

新虫 (正式写手)

[求助] 晶面分析

Figure a,b, shows the analysis of a nanocrystal sitting on the large triangular face bound by a {111} plane. The fringe spacing of 1.4 A can be indexed to the {220} reflection of silver. The inset in Figure b shows a fast Fourier transform (FFT) of the high-resolution image, where the spots have a six-fold symmetryand can be indexed to the {220} reflection, indicating that thenanocrystal was sitting on a {111} face.
  
请大牛们帮我分析一下这个说的是什么意思。怎么从图中看出晶面的?
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