共 60 条
Molecular Identification, Bond Order Discrimination, and Apparent Intermolecular Features in Atomic Force Microscopy Studied with a Charge Density Based Method
被引:40
作者:

Ellner, Michael
论文数: 0 引用数: 0
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机构:
Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain

Pou, Pablo
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机构:
Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain
Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, E-28049 Madrid, Spain Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain

Perez, Ruben
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h-index: 0
机构:
Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain
Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, E-28049 Madrid, Spain Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain
机构:
[1] Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain
[2] Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, E-28049 Madrid, Spain
来源:
关键词:
non-contact atomic force microscopy;
tip functionalization;
CO molecule;
chemical identification;
bond order;
hydrogen bonds;
DFT;
CHEMICAL-STRUCTURE;
CONTRAST;
FIELD;
D O I:
10.1021/acsnano.8b08209
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
We introduce an efficient method to simulate high-resolution atomic force microscopy (HR-AFM) images with CO probes. Our model explicitly takes into account the charge densities of the sample and the probe for the calculation of the short-range (SR) interaction and retains ab initio accuracy with only two parameters, that are essentially universal, independent of the number of chemical species and the complexity of the bonding topology. The application to molecular images shows a strong dependence on the stoichiometry and bonding configuration that precludes the chemical identification of individual atoms based on local force distance curves. However, we have identified features in the 2D images and 3D force maps that reflect the highly anisotropic spatial decay of the molecular charge density and provide a way toward molecular identification. The model treats SR and electrostatics interactions on an equal footing and correctly pinpoints the Pauli repulsion as the underlying interaction responsible for the bond order discrimination in C60. Finally, we settle the controversy regarding the origin of the intermolecular features, discarding the effect of the charge redistribution associated with the H bonds, and linking them with the overlap of the wave functions of the atoms that constitute the bond. This overlap creates saddle regions in the potential energy landscape that are sensed by the probe.
引用
收藏
页码:786 / 795
页数:10
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