Numerical calculations of the harmonic yield from diatomic molecular ions initially prepared in a highly excited vibrational state show a remarkable enhancement of the harmonic energies in the plateau in terms of the ponderomotive energy. The two-step scheme that explains the mechanism of harmonic generation by atoms is extended to our double potential-well structure, providing an explanation for the high photon energies produced.
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Moreno et al. (1997) studied this question.