An ordinary STM image a featureless carbon dot and a time-resolved single molecule absorption STM. (IMAGE)

University of Illinois at Urbana-Champaign, News Bureau

An ordinary STM image a featureless carbon dot and a time-resolved single molecule absorption STM.

Caption

The ordinary scanning tunneling microscopy image of a carbon dot on the left shows only a featureless dot. The time-resolved single molecule absorption STM on the right reveals that laser excitation is initially spread over the whole carbon dot, but within a few picoseconds the excitation migrates to a highly localized area on the surface. The white scale bar is 5 nanometers long.

Credit

Graphic courtesy Martin Gruebele

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