Electron-impact fragmentation of Cl2-

Gerard Collins

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    merged beam technique has been used to investigate the fragmentation of the Cl ion in collisions with electrons over an energy range of 0–200 eV. We have measured absolute cross sections for detachment, detachment plus dissociation and dissociation processes. Over the energy range studied, the dominant breakup mechanism is dissociation. Dissociation is relatively enhanced in the e–+Cl collision system due to the suppression of the normally dominant detachment process, as a result of the large difference between the equilibrium internuclear distances of the Cl2 and Cl ground state potential curves. A prominent structure is observed just above the threshold in the Cl–+Cl+e– dissociation channel. It is proposed that the structure is a resonance associated with production and rapid decay of an excited state of the doubly charged Cl ion. A plausible mechanism for production of the di-anionic state based on an excitation plus capture process is suggested.
    Original languageEnglish
    Article number042708
    Pages (from-to)042708-1-042708-7
    Number of pages7
    JournalPhysical Review A
    Volume72(4)
    Issue number4
    DOIs
    Publication statusPublished - Aug 2005

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    electron impact
    fragmentation
    dissociation
    detachment
    collisions
    excitation
    ions
    retarding
    ground state
    thresholds
    energy
    cross sections
    decay
    curves
    electrons

    Cite this

    Collins, Gerard. / Electron-impact fragmentation of Cl2-. In: Physical Review A. 2005 ; Vol. 72(4), No. 4. pp. 042708-1-042708-7.
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    abstract = "merged beam technique has been used to investigate the fragmentation of the Cl ion in collisions with electrons over an energy range of 0–200 eV. We have measured absolute cross sections for detachment, detachment plus dissociation and dissociation processes. Over the energy range studied, the dominant breakup mechanism is dissociation. Dissociation is relatively enhanced in the e–+Cl collision system due to the suppression of the normally dominant detachment process, as a result of the large difference between the equilibrium internuclear distances of the Cl2 and Cl ground state potential curves. A prominent structure is observed just above the threshold in the Cl–+Cl+e– dissociation channel. It is proposed that the structure is a resonance associated with production and rapid decay of an excited state of the doubly charged Cl ion. A plausible mechanism for production of the di-anionic state based on an excitation plus capture process is suggested.",
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    Collins, G 2005, 'Electron-impact fragmentation of Cl2-', Physical Review A, vol. 72(4), no. 4, 042708, pp. 042708-1-042708-7. https://doi.org/10.1103/PhysRevA.72.042708

    Electron-impact fragmentation of Cl2-. / Collins, Gerard.

    In: Physical Review A, Vol. 72(4), No. 4, 042708, 08.2005, p. 042708-1-042708-7.

    Research output: Contribution to journalArticle

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