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