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Few-Photon Multiple Ionization of N2 by Extreme Ultraviolet Free-Electron Laser Radiation

MPS-Authors
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Jiang,  Y. H.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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

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

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

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

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

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Dörner,  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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Moshammer,  R.
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

Jiang, Y. H., Rudenko, A., Kurka, M., Kühnel, K. U., Ergler, T., Foucar, L., et al. (2009). Few-Photon Multiple Ionization of N2 by Extreme Ultraviolet Free-Electron Laser Radiation. Physical Review Letters, 102(12): 123002, pp. 1-4. doi:10.1103/PhysRevLett.102.123002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7621-5
Abstract
Few-photon multiple ionization of N2 was studied differentially in a reaction microscope using 44 eV, ~25 fs, intense (~1013 W/cm2) photon pulses from FLASH. Sequential ionization is observed to dominate. For various intermediate charge states N2n+ we find a considerable excess of photons absorbed compared to the minimum number that would energetically be required. Photoionization of aligned N2n+ ions, produced by photon absorption in sequential steps, is explored and few-photon absorption pathways are traced by inspecting kinetic energy releases and fragment-ion angular distributions.