IONIZATION OF A 1-D MODEL OF H2 + FROM DIFFERENT STATES IN INTENSE LASER FIELD*

Document Type: Regular Paper

Authors

Department of Chemistry, University of Isfahan, Isfahan 81746-73441, I. R. Iran

Abstract

Time-dependent Schrödinger equation for a 1-D model of hydrogen molecular ion H2
+ in intense
laser field linearly polarized along the molecular axis is solved. Ionization rates are calculated for different
initial states. The evolution of electronic wavefunction at fixed inter-nuclear separations are simulated and
analyzed. The results obtained for the ground state of this 1-D model of H2
+ show appreciable qualitative agreement with the results obtained previously in the 2-D and 3-D studies. The Ponderomotive energy effect on the beginning of ionization in different initial states is observed. The above threshold ionization has a large contribution in the ionization of electrons, except for the ground state and at equilibrium inter-nuclear separation. The ionization rates show that at some inter-nuclear separations larger than 4.0 au, resonance enhancement ionization by some higher excited states occur. At inter-nuclear separations shorter than 4.0 au, the ground state does not show any resonance with higher excited states.

Keywords