We have produced the fullerene dimers C
120, C
120O, and C
120O
2 by a high-speed vibration milling technique.The thermal stability of C
120, C
120O, and C
120O
2 has been studied in the temperature range 150-350
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C forup to 4 h under vacuum. The bridging oxygen atoms were found to substantially increase the stability of thefullerene dimer molecules.