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Break-Up of H2 in Singly Ionizing Collisions with Fast Protons: Channel-Selective Low-Energy Electron Spectra

MPG-Autoren
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Dimopoulou,  C.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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

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Fischer,  D.
Daniel Fischer - Emmy Noether Junior Research Group, Junior Research Groups, 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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Dorn,  A.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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

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

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

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Hagmann,  S.
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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Volltexte (frei zugänglich)

prl_ h2.pdf
(Preprint), 123KB

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Zitation

Dimopoulou, C., Moshammer, R., Fischer, D., Höhr, C., Dorn, A., Fainstein, P. D., et al. (2004). Break-Up of H2 in Singly Ionizing Collisions with Fast Protons: Channel-Selective Low-Energy Electron Spectra. Physical Review Letters, 93: 123203. doi:10.1103/PhysRevLett.93.123203.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-8B47-6
Zusammenfassung
Dissociative as well as nondissociative single ionization of H2 by 6 MeV proton impact has been studied in a kinematically complete experiment by measuring the momentum vectors of the electron and the H+ fragment or the H2+ target ion, respectively. For the two ionization pathways, the electron spectra reveal the role of autoionization of the doubly and singly excited states of H2. The latter explicitly involve the coupling between the electronic and the nuclear motion of the molecule. This is a clear manifestation of a breakdown of the Born-Oppenheimer approximation.