Strong-field ionization of H2 from ultraviolet to near-infrared wavelengths: Photoelectron energy and angular identifications

Timo Wilbois and Hanspeter Helm
Phys. Rev. A 84, 053407 – Published 11 November 2011

Abstract

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.

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  • Received 18 July 2011

DOI:https://doi.org/10.1103/PhysRevA.84.053407

©2011 American Physical Society

Authors & Affiliations

Timo Wilbois* and Hanspeter Helm

  • Department of Molecular and Optical Physics, University of Freiburg, Stefan-Meier-Strasse 19, D-79104 Freiburg, Germany

  • *wilbois@cip.physik.uni-freiburg.de
  • helm@uni-freiburg.de

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Vol. 84, Iss. 5 — November 2011

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