Abstract
Charge inversion mass spectra of C2H2+ ions produced by electron impact from HC≡CH and CH2=CCl2 were measured using K and Cs targets. Clear differences in the charge inversion spectra between HC≡CH and CH2=CCl2 indicate that the C2H2+ ion formed from CH2CCl2 is H2C=C+⋅. The lifetime of H2C=C+⋅ is found to be longer than 8.5 μs, and the state is proposed to be the 2B1 ground-state rather than the 4A2 state.
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