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Atomic force microscopy image of a single silicon adatom, size 660 pm x 660 pm x 120 pm. The two crescents are interpreted to represent two orbitals originating in a single tip atom.
Giessibl, Hembacher, Bielefeldt and Mannhart. Science 289, 422 (2000).
Image courtesy: Drs. Jochen Mannhart, Franz Giessibl, University of Augsburg, Germany.