Simultaneous Reflexion in Electron Diffraction as a Cause of the Failure of Friedel's Law
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概要
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Miyake and Uyeda found a remarkable phenomenon: that an asymmetry occurs in the intensities of a pair of reflexions (hhl) and (hhl) when an electron beam impinges upon a cleavage face (100) of a zincblende crystal in the [110] azimuth, which violates Friedel's law. In the present paper this phenomenon is studied in detail by applying the dynamical theory. Assuming the intensities of only the twor eflexions (hhl) and (hhl) to be large and neglecting all other reflexions, we find that asymmetry occurs for an odd index when the selective reflexion takes place in the Bragg case, and does not for an even index. By numerical calculation. (331) has one peak and (331) has two peaks, with the integrated intensity of (331) larger than that of (331). These results are in accordance with the general trend of experimental observations. Detailed features of experimental observations which are inconsistent with this theory may be explained qualitatively by taking into account the effect of weak reflexions or additional simultaneous reflexions. The present work proves that Friedel's law fails in the dynamical theory. It must be emphasized that the failure is not caused by the effect of absorption or dispersion, but is due to a dynamical interaction between simultaneously excited reflexion.
- 社団法人日本物理学会の論文
- 1954-10-25
著者
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Kohra Kazutake
Institute For Super Materials Ulvac Japan Ltd.
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Kohra Kazutake
Institute Of Physics College Of General Education University Of Tokyo
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