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Photopreparation of molecular hydrogen ions in intense laser fields

  • C. SCHELLHAMMER (a1), V. SCHYJA (a1), A. HIELSCHER (a1) and H. HELM (a1)
    • Published online: 09 April 2001

Detailed experiments on the energy and angular distributions of both electrons and protons formed from molecular hydrogen in strong femtosecond laser fields are reported. At the wavelengths 389 and 406 nm the ionization dynamics is governed by resonance shifting of molecular Rydberg states. Differences from this mechanism appear only at the very lowest intensities, when close lying resonances of the E, F-state determine the photoelectron pattern in resonant enhanced ionization, and at very high intensities, when tunnel ionization suppresses molecular details. At wavelengths below 400 nm at intensities in the range of ≈1·1013 W/cm2 femtosecond pulses are quite suitable for preparation of state selected H2+ targets in a restricted range of vibrational levels.

Corresponding author
Address correspondence and reprint requests to: H. Helm, Albert-Ludwigs Universitat, Fakultat fur Physik, Hermann Herderstr. 3, D-79104 Freiburg, Germany. E-mail:
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Laser and Particle Beams
  • ISSN: 0263-0346
  • EISSN: 1469-803X
  • URL: /core/journals/laser-and-particle-beams
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