Reasearchers from IBM Zurich obtained molecule-resolution images of pentacene. They clearly show the hexagon-like benzene rings. The technique is a modified AFM (atomic force microscopy), where the scanning tip is covered with a single molecule of carbon monoxide. This change causes a slight repulsion between the molecule and the probe, which avoids destroying the molecule being imaged.
Ref: Science 28 August 2009:
Vol. 325. no. 5944, pp. 1110 - 1114
DOI: 10.1126/science.1176210
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