A CaF2 atomic force microscope tip interacts with a CaF2 substrate in the presence of screening water molecules. Ca: turquoise; F: green or yellow; O: red; H: silver.
From the article:
Mechanism of Contrast Formation in Atomic Force Microscopy in WaterMatthew Watkins and Alexander L. Shluger
Phys. Rev. Lett. 105, 196101 (2010)
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