Scattering of X-rays from crystal surfaces
Scattering of X-rays from crystal surfaces
复制标题
X 射线从晶体表面的散射
DOI：
10.1088/0022-3719/18/35/008
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
R. Cowley
中科院分区：
文献类型：
--
作者：
S. R. Andrews;R. Cowley
对各种材料进行的X射线测量表明，可以观察到源于晶体表面密度突变的漫散射。一般来说，这种不连续性会导致倒易空间中的散射棒，这些散射棒在布拉格峰τ附近最强烈，并且对于足够光滑的表面是很好定义的。对于波矢转移Q= τ +q的散射强度的q依赖性给出了晶体表面的地形结构的信息。GaAs和KTaO3晶体，以各种方式制备的表面上的实验结果，获得使用传统的X射线技术与旋转阳极源，并可以描述的表面的连续模型。模型的预测与实验结果之间存在差异，这表明需要进一步的实验来实现更完整的理解。
X-ray measurements performed on a variety of materials demonstrate that it is possible to observe diffuse scattering that originates in the abrupt change of density at a crystal surface. Such a discontinuity gives rise, in general, to rods of scattering in reciprocal space which are most intense close to the Bragg peaks tau and are well defined for sufficiently smooth surfaces. For wave-vector transfer Q= tau +q the q-dependence of the intensity of scattering gives information on the topographic structure of the crystal surface. Experimental results on crystals of GaAs and KTaO3, with surfaces prepared in various ways, were obtained using conventional X-ray techniques with a rotating anode source and can be described by a continuum model of the surface. There are discrepancies between the predictions of the models and the experimental results and these suggest that further experiments are needed to achieve a more complete understanding.