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Journal Articles

Evidence for a difference in the dissociation mechanisms of acetylene (HCCH) and vinylidene (H $_{2}$ C=C:) from charge inversion mass spectrometry

Hayakawa, Shigeo*; Tomozawa, Koji*; takeuchi, takae*; Arakawa, Kazuo; Morishita, Norio

Physical Chemistry Chemical Physics, 5(11), p.2386 - 2390, 2003/05

https://doi.org/10.1039/B212834A

Times Cited Count：15 Percentile：44.34(Chemistry, Physical)

The process of formation of the negative ions in charge inversion mass spectrometry is via near-resonant neutralization followed by spontaneous dissociation, and then endothermic negative ion formation. The intensity of the C $_{2}$ $^{-}$ peak relative to the C $_{2}$ H $^{-}$ peak in these spectra increased with decreasing ionization potential of the targets for both of the isomeric C $_{2}$ H $_{2}$ $^{+}$ cations. The formation of the C $_{2}$ $^{-}$ anion is proposed to result from the dissociation of excited C $_{2}$ H $_{2}$ neutrals into C $_{2}$ and H $_{2}$ . The dependence on target species of the intensities of C $_{2}$ $^{-}$ peak relative to the C $_{2}$ H $^{-}$ peak for HCCH and H $_{2}$ C=C: cannot be rationalized by the internal energy of the excited C $_{2}$ H $_{2}$ neutrals. The differences indicate that the isomeric C $_{2}$ H $_{2}$ neutrals dissociate into C $_{2}$ H and H prior to 1,2-hydrogen atom migration.