Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: STM/AFM: New Approaches
O 15.10: Vortrag
Montag, 7. März 2016, 17:30–17:45, H24
Understanding high-resolution AFM images of water clusters on NaCl substrate — •Prokop Hapala1, Jing Guo2, Jinbo Peng2, Duanyun Cao2, Limei Xu2, Enge Wang2, Ying Jiang2, and Pavel Jelinek1 — 1Institute of Physics , Academy of Sciences of the Czech Republic, Cukrovarnická 10, Prague, 16253, Czech Republic — 2International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, China
AFM using functionalized tips not only reveals chemical bonds within molecules [1], but it is also an ideal tool for sensing of non-covalent interactions. Recently we uncovered, using our molecular mechanics model [2], a crucial importance of electrostatic interaction in AFM images of various polar molecules [3]. In this talk we will show that the AFM imaging of water clusters formed on NaCl surface [4] is also governed by electrostatic field originating from both the polar O-H bonds and the ionic surface. The theoretical and experimental comparison between CO and Cl modified tip indicate that chiral pattern observed with negatively charged Cl tip is predominantly due to electrostatics. The ability to acquire and understand high-resolution AFM images of weakly bonded systems opens new possibilities of AFM in supra-molecular chemistry and biochemistry. 1. Gross, L. et, al. Science 325, 1110-1114 (2009). 2. Hapala, P. et al. Phys. Rev. B 90, 085421 (2014). 3. Hapala, P. et al. (2015) ( submitted ) 4. Guo, J. et al. Nat. Mater. 13, 184-9 (2014).