Abstract
The interference fringes of above-threshold ionization (ATI) spectrum from atoms or molecules have been extensively studied. In this paper, we investigate the ATI of the polyatomic molecule SF6 in IR + XUV two-color laser fields, and find that some interference fringes on the spectrum are from the molecular structure, which is independent of the parameters of the laser field. Based on the frequency-domain theory, we analyze the interference fringes for different orbitals of SF6 molecules in detail. It is found that the orbital of SF6 can be simplified by several terms in the region of high value of momentum, where the destructive interference fringes from these terms may carry the information of the molecular structure. Furthermore, we obtain destructive interference formulas from these simplified orbitals, which may predict the interference fringes on the ATI spectrum. Additionally, we may obtain the information about the bond length of molecules. It will be useful for the study of the ionization spectrum of polyatomic molecules.
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