Abstract
The molecular high-order harmonic generations (HHGs) from H2+ and HeH2+ are theoretically investigated by solving the time-dependent Schrödinger equation based on the Born-Oppenheimer approximation. The contributions of different recombination pathways in the high-order harmonic generation of H2+ and HeH2+ are discussed via the wavelet time-frequency analysis. By the analysis of the temporal structures of the different recombination pathways, the spectral minima in the molecular HHG are attributed to the destructive interferences of the recombination pathways from the two localized states. The result provides a new insight into clarifying the spectral minima in the molecular HHG.
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