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Separation of Recollision Mechanisms in Non-Sequential Strong Field Double Ionization of Ar: The Role of Excitation-Tunneling

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

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Crespo López-Urrutia,  J.
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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Neumayer,  P.
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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Citation

Feuerstein, B., Moshammer, R., Fischer, D., Dorn, A., Schröter, C., Deipenwisch, J., et al. (2001). Separation of Recollision Mechanisms in Non-Sequential Strong Field Double Ionization of Ar: The Role of Excitation-Tunneling. Physical Review Letters, 87: 043003-1, pp. 1-4. doi:10.1103/PhysRevLett.87.043003.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-857C-2
Abstract
Vector momentum distributions of two electrons created in double ionization of Ar by 25 fs, 0.25 PW/cm2 laser pulses at 795 nm have been measured using a "reaction microscope." At this intensity, where nonsequential ionization dominates, distinct correlation patterns are observed in the two-electron momentum distributions. A kinematical analysis of these spectra within the classical "recollision model" revealed an (e, 2e)-like process and excitation with subsequent tunneling of the second electron as two different ionization mechanisms. This allows a qualitative separation of the two mechanisms demonstrating that excitation-tunneling is the dominant contribution to the total double ionization yield.