Sensitivity of high-order harmonic generation to nuclear motion

The harmonic generations of molecular ion H2+ and D2+ exposed to an intense laser field have been studied with the collinear reduced-dimensionality model. The numerical solution of the time-dependent Schrödinger equation for H2+ and its isotopic variant D2+ shows that high-order harmonic generation is sensitive to the initial vibrational states of the molecular ion. By comparing the spectra of H2+ with D2+, it is shown more intense harmonics are generated in lighter isotopes.