ionization of a 1-d model of h2 + from different states in intense laser field*

time-dependent schrödinger equation for a 1-d model of hydrogen molecular ion h2+ in intenselaser field linearly polarized along the molecular axis is solved. ionization rates are calculated for differentinitial states. the evolution of electronic wavefunction at fixed inter-nuclear separations are simulated andanalyzed. 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.