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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.

Journal Articles

A New technique to study the dissociation of energy-selected neutral intermediates

Hayakawa, Shigeo*; Harada, Kengo*; Watanabe, Nobuaki*; Arakawa, Kazuo; Morishita, Norio

International Journal of Mass Spectrometry, 202(1-3), p.A1 - A7, 2000/10

https://doi.org/10.1016/S1387-3806(00)00286-4
 Times Cited Count：16 Percentile：60.02(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Definitive evidence for the existence of a long-lived vinylidene radical cation, H$$_{2}$$C=C$$^{+}$$

Hayakawa, Shigeo*; *; Arakawa, Kazuo; Morishita, Norio

Journal of Chemical Physics, 110(6-8), p.2745 - 2748, 1999/02

https://doi.org/10.1063/1.477875
 Times Cited Count：21 Percentile：55.26(Chemistry, Physical)

no abstracts in English

Journal Articles

Dissociation mechanism of electronically excited C$$_{3}$$H$$_{4}$$ isomers by charge inversion mass spectrometry

Hayakawa, Shigeo*; *; Arakawa, Kazuo; Morishita, Norio

Int. J. Mass Spectrom. Ion Process, 171(1-3), p.209 - 214, 1997/00

no abstracts in English

Journal Articles

Discrimination of C$$_{3}$$H$$_{4+}$$ isomeric ions by charge inversion mass spectrometry using an alkali metal target

*; *; Arakawa, Kazuo; Morishita, Norio; *

Int. J. Mass Spectrom. Ion Process, 151, p.89 - 95, 1995/00

no abstracts in English

5 (Records 1-5 displayed on this page)
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