Soot in carbon-arc smoke has been studied by electron microscopy and X-ray diffraction. The soot was directly collected from the smoke on an electron-microscope grid covered with a carbon film. Many C60crystals were found in the soot. Amorphous carbon and graphite particles were also observed. The fullerene content in the soot was more than 60%. The C60molecules were found as crystals in the soot, which were face-centered cubic. It is shown from the calculation of the diffraction intensity from a C60crystal that the absence of the (002) diffraction is attributable to rapid rotation of C60molecules. © 1993.
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