2-ELECTRON MOLECULE IN WEAK, STRONG, AND ULTRASTRONG LASER FIELDS - AONE-DIMENSIONAL MODEL

We examine the interaction 6f a one-dimensional model molecule with tw o electrons and two nuclei in a very short pulse of light fields of di fferent strength. Due to their high masses and the shortness of the pu lse, the dynamics of the nuclei can be regarded as frozen during the p ulse and only the electronic part of the wave function has to be taken into account. After the pulse the molecule will dissociate on a large r time scale if the electrons are not in a binding state, especially i f both electrons are removed from the molecule. One finds that the ion ization and dissociation probability decrease with increasing field st rength for very high laser intensities, a phenomenon which is already known for the ionization of atoms. By examination of the shape of the wave function during the pulse one sees that the electrons are trapped in bound states of the time-averaged Kramers-Henneberger potential.