Contrast formation in atomic resolution scanning force microscopy on CaF2(111): experiment and theory
Contrast formation in atomic resolution scanning force microscopy on CaF2(111): experiment and theory
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CaF2(111)原子分辨率扫描力显微镜中的对比形成：实验与理论
DOI：
10.1088/0953-8984/13/10/303
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Shluger
中科院分区：
文献类型：
--
作者：
C. Barth;A. Foster;M. Reichling;A. Shluger
我们研究了CaF2（111）表面平坦台阶的原子分辨率成像中的对比度形成机制，扫描力显微镜在动态模式下工作。实验结果解释与原子模型的基础上的理论。实验揭示了三角形的形式，可以被解释为是由于从两个不同的亚晶格的正终止尖端与氟离子的相互作用的理论特征的对比度功能。结果与负终止的提示被发现是不兼容的实验。我们证明，理论正确预测的趋势，对比度变化时，不同的尖端表面的距离，但也是有限的定量协议，由于非理想的原子结构的真实的提示。然而，在这样的特点不发挥主要作用的距离范围内，我们发现良好的定量理论预测和实验结果之间的一致性。理论和实验扫描线之间的比较的有效性进行了详细讨论，使用广泛的统计图像分析。
We investigate mechanisms of contrast formation in atomic resolution imaging of flat terraces on the CaF2(111) surface with scanning force microscopy operated in the dynamic mode. Experimental results are interpreted with a theory based on atomistic modelling. Experiments reveal characteristic contrast features in the form of triangles that can be explained by theory as being due to the interaction of a positively terminated tip with fluorine ions from two different sublattices. Results for a tip with negative termination are found not to be compatible with experiments. We demonstrate that theory correctly predicts the trend in contrast changes when varying the tip-surface distance but is also limited in quantitative agreement due to the non-ideal atomic structure of real tips. In a distance range where such peculiarities do not play a major role, however, we find good quantitative agreement between theoretical predictions and experimental results. The validity of the comparison between theory and experimental scan lines is discussed in detail using an extensive statistical image analysis.