Semiclassical Approach to Non-Sequential Double Ionization of Diatomic Molecules in Strong Laser Field
LIU Jie1, CHEN Jing1,2
1Institute of Applied Physics and Computational Mathematics, PO Box 8009(28), Beijing 100088
2Department of Chemistry, University of Kansas and Kansas Center for Advanced Scientific Computing, Lawrence, KS 66045, USA
Semiclassical Approach to Non-Sequential Double Ionization of Diatomic Molecules in Strong Laser Field
LIU Jie1;CHEN Jing1,2
1Institute of Applied Physics and Computational Mathematics, PO Box 8009(28), Beijing 100088
2Department of Chemistry, University of Kansas and Kansas Center for Advanced Scientific Computing, Lawrence, KS 66045, USA
Abstract： We develop a semiclassical model to describe the non-sequential double ionization of diatomic molecules in an intense linearly polarized field, achieving insight into the two-electron correlation effect in the ionization dynamics. Compared to the experimental data of nitrogen molecules, our model shows a good agreement in the tunnelling regime and a qualitative agreement in the over-barrier regime. We find that the classical collisional trajectories are the main source of the double ionization in the tunnelling regime. As a prediction of our theory, we also calculate the double ionization ratios of H222+H22+ for hydrogen molecules and predict a ratio less than that of nitrogen molecules.
2006, Vol. 23 
