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Utilizing a crosses electron‐beam/molecular‐beam collision geometry, mass spectra of C 60 and C 70 ions have been obtained for an electron impact energy range of 20 eV to 600 eV. These spectra are dominated by singly and doubly ionized species. The intensity of fragment ions is very weak, which is in agreement with previous observations. Ionization efficiency curves for the formation of C and C have also been obtained near their threshold regions. From these curves, appearance energies (AE) of these ions have been derived. The AE for C is found to be 7.8±0.3 eV, which agrees well with previous measurements. However, our value of 16.4±0.3 eV for the formation of C is much lower than the value of 19.0±0.3 eV obtained by photo‐ionization techniques.
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Srivastava et al. (1993) studied this question.
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