Physics – Atomic and Molecular Clusters
Scientific paper
2007-08-16
Phys. Rev. A 77, 013403 (2008)
Physics
Atomic and Molecular Clusters
8 pages, 9 figures
Scientific paper
10.1103/PhysRevA.77.013403
In the present paper, we develop a semiclassical quasi-static model accounting for molecular double ionization in an intense laser pulse. With this model, we achieve insight into the dynamics of two highly-correlated valence electrons under the combined influence of a two-center Coulomb potential and an intense laser field, and reveal the significant influence of molecular alignment on the ratio of double over single ion yield. Analysis on the classical trajectories unveils sub-cycle dynamics of the molecular double ionization. Many interesting features, such as the accumulation of emitted electrons in the first and third quadrants of parallel momentum plane, the regular pattern of correlated momentum with respect to the time delay between closest collision and ionization moment, are revealed and successfully explained by back analyzing the classical trajectories. Quantitative agreement with experimental data over a wide range of laser intensities from tunneling to over-the-barrier regime is presented.
Chen Jing
Liu Jie
Ye Di-Fa
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