The structure looks like treetop is an aggregate of
colloidal gold particles. The structure was formed by an electron beam irradiation
in a transmission electron microscope.
At 56th photo contest hosted by the Japanese Society
of Electron Microscopy in 2000.
Condition
Specimen : Colloidal gold particle on a carbon film
Instrument : Cold Field Emission Transmission Electron Microscope HF-2000
Magnification : X 2,000
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when the photo was taken.