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Knudsen cell mass spectrometry has been used for the investigation of ion‐molecule equilibria between gaseous neutral species and negative ions in fullerenc vapors at 800–900 K. Equilibrium constants of one‐electron exchange reactions between C 60 and the higher fullerenes C 70 , C 76 , C 78 and C 84 have been measured. Electron affinities of C 70 , C 76 , C 78 and C 84 were found to be 2.72 ± 0.05, 2.88 ± 0.05, 3.01 ± 0.07, and 3.05 ± 0.08 eV respectively. Negative ions of C 86 , C 90 , and C 92 were observed, and the lower limit of electron affinities for these species was estimated as ≥3.0eV.
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Boltalina et al. (1993) studied this question.
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