Decoding the minimum-yield position of high-order harmonic generation from H2+with a large internuclear distance

By numerically solving the time-dependent Schrodinger equation, we investigate the harmonic emission of H2+ with a large internuclear distance in the midinfrared laser field. We find that multiple minima are observed in the high-order harmonic spectra. As the laser wavelength and intensity increase, the harmonic minima gradually shift to the high-energy region, which is different from the position of the minima predicted by the originally studied two-center interference. We modify the formula so that the position of the minimum yield of high order harmonics generated at large internuclear distances can be accurately interpreted by our modified formula. Consequently, by using the harmonic minimum, it is feasible to determine the parameters of the driving laser and the bond length of the molecule. Additionally, we discuss the impact of nuclear motion and laser pulse duration on the position of harmonic minimum.