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Based on the frequency-domain theory, we put forward a method of imaging thecomplex symmetrical polyatomic molecules by using IR+XUV two-color laserfields. Although the wave function of a polyatomic molecule, such as SF6, isquite complex in momentum space, it can be simplified by several terms in theregion of high value of momentum, where the destructive interference fringesfrom these terms carry the information of the molecular structure. In thiswork, we find that, since the XUV laser field may increases the kinetic energyof the photoelectron dramatically in the above-threshold ionization (ATI)process of a molecule in an IR+XUV two-color laser field, the information ofthe molecular structure can be obtained by analyzing the interference fringesof the ATI spectrum in the high-energy region, where the simplified wavefunction of the molecule plays a dominant role in this part of the ATIspectrum. This method provides a unique accessible route towards imagingpolyatomic molecules from a frequency perspective.

Imaging the geometrical structure of complex symmetric molecules by above-threshold ionization spectrum in an IR+XUV laser field