Resonance effects in low and high energy electron diffraction by crystals
Resonance effects in low and high energy electron diffraction by crystals
复制标题
晶体低能和高能电子衍射的共振效应
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
K. Hayakawa
中科院分区：
文献类型：
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作者：
S. Miyake;K. Hayakawa
本文主要根据对闪锌矿、氧化镁和砷化镓晶体两个能区电子的实验观测，讨论了晶体高能电子衍射图中的反常强度效应与LEED中所谓的共振效应之间的关系。结果表明，这两种效应本质上是同一性质的。指出，当镜面光斑也是布拉格反射光斑时，镜面光斑和其他劳埃区光斑在共振条件下的强度增强尤为明显。结合共振条件下出现的电子散射总强度增强、二次电子发射增加和X射线发射产额变化等现象，讨论了共振时晶体中产生的波场的性质。
The relation between an anomalous intensity effect in patterns from high energy electron diffraction by crystals, and the so-called resonance effect in LEED, is discussed mainly on the basis of experimental observations with electrons in both energy ranges, using crystals of zincblende, magnesium oxide and gallium arsenide. It is concluded that these two effects are essentially of the same nature. It is pointed out, that the intensity enhancement of the specular spot and other Laue-zone spots, which occurs under conditions of resonance, is particularly conspicuous when the specular spot is also a Bragg reflection spot. The nature of the wavefield generated in the crystal at resonance is discussed in connexion with other phenomena which appear under the resonance condition, such as the overall intensity enhancement of electron scattering, the increase of secondary electron emission and the variation of X-ray emission yield.