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Elliptical carbon onions were produced from amorphous carbon by electron beam irradiation. Atomic structure and structural stability of the onion were investigated by high-resolution electron microscopy, molecular mechanics calculation and molecular orbital calculation, and a structure model of C24@C84 was proposed at the center of the elliptical onion.PACS. 61.48.+c Fullerene and fullerene-related materials -61.16.-d Electron, ion, and scanning probe microscopy -31.15.Ct Semi-empirical and empirical calculations (differential overlap, Hünkel, PPP methods, etc.)

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