Temperature dependence of reflection high-energy electron diffraction intensity from Si(111)-7×7 superlattice
Temperature dependence of reflection high-energy electron diffraction intensity from Si(111)-7×7 superlattice
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Si(111)-7×7超晶格反射高能电子衍射强度的温度依赖性
DOI：
10.1116/1.580773
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Y. Shigeta
中科院分区：
文献类型：
--
作者：
K. Yamaguchi;H. Mitsui;Y. Shigeta
在温度为293、523和653 K的情况下，在Si(111)-（7×7）表面用改变偏转角度的反射高能电子衍射仪（RHEED）观察了反射高能电子衍射（RHEED）的摇摆曲线。利用Dudarev等人提出的方法，通过原子热振动引起的热扩散散射对应的势的实部和虚部的变化来计算RHEED强度的温度依赖性。科学通报，2004(2)。根据爱因斯坦模型，我们假设热振动的振幅（德拜参数）随温度的增加而增加。通过与实验结果的比较，确定了（7×7）结构在该温度范围内满足观察到的RHEED摇摆曲线的原子位置。表面原子的位置与用从头算分子动力学方法得到的结果几乎一致(Brommer et al. [Phys。]Rev. Lett. 68, 1355(1992)])在…
Rocking curves of reflection high-energy electron diffraction (RHEED) were observed from Si(111)-(7×7) surface at temperature of 293, 523, and 653 K by a RHEED apparatus with a magnetic deflector to change the glancing angle. The temperature dependence of RHEED intensity was calculated with change of the real and imaginary part of the potential corresponding to the thermal diffuse scattering arising from a thermal vibration of atoms, which was obtained by the way proposed by Dudarev et al. [Surf. Sci. 330, 86 (1995)]. We assumed that the amplitude of the thermal vibration (Debye parameter) increases with temperature according to the Einstein model. By comparing with the experimental results, the atomic positions of the (7×7) structure satisfying the observed RHEED rocking curves in this temperature range is determined. The positions of the surface atoms are almost coincident with the results obtained by using ab initio molecular-dynamics scheme (Brommer et al. [Phys. Rev. Lett. 68, 1355 (1992)]) within th...