Triple coincidence (e,γ2e) experiment for simultaneous electron impact ionization excitation of helium

G. Sakhelashvili*, A. Dorn, C. Höhr, J. Ullrich, A. S. Kheifets, J. Lower, K. Bartschat

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    Simultaneous ionization and excitation of helium atoms by 500 eV electron impact is observed by a triple coincidence of an ionized slow electron, the recoiling He+ ion, and the radiated vacuum ultraviolet photon (λ≤30.4nm). Kinematically complete differential cross sections are presented for the He+(2p)2P final ionic state, demonstrating the feasibility of a quantum mechanically complete experiment. The experimental data are compared to predictions from state-of-the-art numerical calculations. For large momentum transfers, a first-order treatment of the projectile-target interaction can reproduce the experimental angular dependence, but a second-order treatment is required to obtain consistent magnitudes.

    Original languageEnglish
    Article number033201
    JournalPhysical Review Letters
    Volume95
    Issue number3
    DOIs
    Publication statusPublished - 15 Jul 2005

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