Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster: Interaction with strong or short laser pulses
A 15.15: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Tunneling theory of H2 in presence of strong linear and circular polarized fields — •Abdou Mekky Hussien and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
The ratio ℜ of the angular ionization probabilities of H2 between parallel and perpendicular molecular orientations in a linear and a circular polarized fields using a molecular tunneling theory (MO-ADK [1]) is studied. It is found that the ratio ℜ for an H2 molecule in a strong field generally decreases with increases laser intensity, and the pattern of decrease depends on the duration of the laser pulse. A reasonable agreement with the experimental data in [2] is observed. These results invalidate the main result in [3] and corresponding statements in other works, where it is claimed that MO-ADK theory fails to predict the intensity-dependent anisotropy of H2. Furthermore, the effect of the focal-volume averaging on the anisotropy is studied. Finally, an extention of the MO-ADK model into the barrier-suppression regime is also given. A further improvement of the results at high intensities is found, if this correction is considered.
[1] X. M. Tong et al., Phys. Rev. A, 66, 033402 (2002).
[2] A. Staudte et al., Phys. Rev. Lett. 102, 033004 (2009).
[3] Y.-J. Jin et al., Phys. Rev. A, 83, 063409 (2011).