Orientation dependence of nonadiabatic molecular high-order-harmonic generation from resonant polar molecules

摘要

Orientation-dependent nonadiabatic molecular high-order-harmonic generation (MHOHG) is studied for thenone-electron polar diatomic molecular ion HeH2+ exposed to short, linearly polarized, intense laser fields. Thenfully dimensional time-dependent Schr¨odinger equation is solved numerically. The resonance of excited states isnmaximal in the parallel orientation, while it is minimal in the perpendicular case for the nonsymmetric molecularnion. The resulting redshift and the overall intensity of MHOHG strongly depend on the electronic symmetry andncharge transfer of the resonant excited states. These results are used to confirm the proposed four-step model innMHOHG involving intermediate resonance states.