Strong Laser Fields
Department of Molecular and Optical Physics - University of Freiburg, Germany.
Strong-field ionization of H2 from ultraviolet to near-infrared wavelengths: Photoelectron energy and angular identifications
Timo Wilbois and Hanspeter Helm
Department of Molecular and Optical Physics, University of Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
Phys. Rev. A 84, 053407 (2011) [12 pages]
Strong-field ionization of molecular hydrogen is studied at wavelengths ranging from 300 to 800 nm using pulses of 100-fs duration. We find that over this wide wavelength range, from nominally 4-photon to 11-photon ionization, resonance features dominate the ionization probability at intensities below 1014 W/cm2. Photoelectron momentum maps recorded by an imaging spectrometer are analyzed to identify the wavelength-dependent ionization pathways in single ionization of molecular hydrogen. A number of models, some empirical, which are appropriate for a quantitative interpretation of the spectra and the ionization yield are introduced. A near-absolute comparison of measured ionization yields at 398 nm is made with the predictions based on a numerical solution [Y. V. Vanne and A. Saenz, Phys. Rev. A 79, 023421 (2009)] of the time-dependent Schrödinger equation for two correlated electrons.
©2011 American Physical Society