Strong Laser Fields
Welcome to the Strong Fields Group at the Department of Molecular and Optical Physics, University of Freiburg, Germany.

Photopreparation of molecular hydrogen ions in intense laser fields
C.Schellhammer, V. Schyja, A. Hielscher and H. Helm
Department of Molecular and Optical Physics, Albert-Ludwigs-Universität, Hermann-Herder-Strasse 3, D-79104  Freiburg, Germany


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 [approximate]1·1013 W/cm2 femtosecond pulses are quite suitable for preparation of state selected H2+ targets in a restricted range of vibrational levels.

© 2000 Cambridge University Press

© Laser and Particle Beams (2000), 18:443-448 Cambridge University Press


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