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Triple Coincidence (e,γ2e) Experiment for Simultaneous Electron Impact Ionization Excitation of Helium

MPG-Autoren
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Sakhelashvili,  G.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Dorn,  A.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Höhr,  C.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Ullrich,  J.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Sakhelashvili, G., Dorn, A., Höhr, C., Ullrich, J., Kheifets, A. S., Lower, J., et al. (2005). Triple Coincidence (e,γ2e) Experiment for Simultaneous Electron Impact Ionization Excitation of Helium. Physical Review Letters, 95(3): 033201, pp. 1-4. Retrieved from http://link.aps.org/abstract/PRL/v95/e033201.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-8891-5
Zusammenfassung
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 (lambda<=30.4 nm). 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.