Two-center interference in high harmonic generation from diatomic molecule: detailed numerical study

We present a detailed study of two-center interference in high harmonic generation from a diatomic molecule via an extensive 2D numerical simulation for H-2(+) molecular ion. Our study embraces a wide range of both molecular and laser parameters, such as molecular orientation angle, internuclear distance, and laser field intensity. Based on these simulations, we compare the different dispersion relations between the emitted photon frequency and recolliding electron kinetic energy from the viewpoint of an accuracy of the extraction of molecular parameters. We show that our numerical data cannot be fitted solely by any of the simplest relations discussed in the literature. We show also that the spectral interference minima positions strongly depend on the laser intensity, in contradiction with the simple semiclassical model.