TRUNCATION-ROD SCATTERING - ANALYSIS BY THE DYNAMIC THEORY OF X-RAY-DIFFRACTION

被引:20
作者
COLELLA, R
机构
[1] Purdue University, Physics Department, West Lafayette
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 17期
关键词
D O I
10.1103/PhysRevB.43.13827
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The concept of truncation-rod scattering is analyzed in terms of standard dynamical theory, and specifically applied to grazing-incidence experiments on unreconstructed surfaces in which diffraction peaks are observed in the neighborhood of "anti-Bragg" points. A computer simulation of the (001) peak from the (110) surface of copper, based on a version of dynamical theory without approximations, is indeed able to reproduce the observed peak. The calculated penetration depth turns out to be 2700 angstrom. It is found that the intensity along a truncation rod is a slow function of the angle of incidence, except when the scattered beam becomes evanescent. At this point the reflectivity has a sharp peak of asymmetric shape. For any given incident beam several scattered beams are simultaneously excited, with reflectivities in the range of 10(-5)-10(-9). It is shown how n-beam dynamical theory leads to a description of truncation-rod scattering in terms of diffraction from a two-dimensional lattice, and how the intensities of the scattered beams are obtained from first principles.
引用
收藏
页码:13827 / 13832
页数:6
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