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Ionization, excitation, and de-excitation to the ground state is studiedtheoretically for the first excited singlet state B $^1\Sigma_u^+$ of H$_2$exposed to intense laser fields with photon energies in between about 3 eV and13 eV. A parallel orientation of a linear polarized laser and the molecularaxis is considered. Within the dipole and the fixed-nuclei approximations thetime-dependent Schr\"odinger equation describing the electronic motion issolved in full dimensionality and compared to simpler models. A dramaticbreak-down of the single-active-electron approximation is found and explainedto be due to the inadequate description of the final continuum states.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Break-down of the single-active-electron approximation for one-photon  ionization of the B $^1\Sigma_u^+$ state of H$_2$ exposed to intense laser  fields