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Photopreparation of molecular hydrogen ions in intense laser fields

Published online by Cambridge University Press:  09 April 2001

C. SCHELLHAMMER ,
V. SCHYJA ,
A. HIELSCHER  and
H. HELM
C. SCHELLHAMMER
Affiliation:
Department of Molecular and Optical Physics, Fakultät für Physik, Albert-Ludwigs Universität, Hermann Herderstr. 3, 79104 Freiburg, Germany
V. SCHYJA
Affiliation:
Department of Molecular and Optical Physics, Fakultät für Physik, Albert-Ludwigs Universität, Hermann Herderstr. 3, 79104 Freiburg, Germany
A. HIELSCHER
Affiliation:
Department of Molecular and Optical Physics, Fakultät für Physik, Albert-Ludwigs Universität, Hermann Herderstr. 3, 79104 Freiburg, Germany
H. HELM
Affiliation:
Department of Molecular and Optical Physics, Fakultät für Physik, Albert-Ludwigs Universität, Hermann Herderstr. 3, 79104 Freiburg, Germany
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Abstract

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.

Type
ULIA-1 CONFERENCE PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 3 , July 2000 , pp. 443 - 448
Copyright
© 2000 Cambridge University Press

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