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 SF 6 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 SF 6 molecules in detail. It is found that the orbital of SF 6 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 molecule...

中文翻译：

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IR + XUV激光场中SF 6分子的阈值以上电离谱的干涉条纹

来自原子或分子的高于阈值电离（ATI）光谱的干涉条纹已得到广泛研究。在本文中，我们研究了红外+ XUV双色激光场中多原子分子SF 6的ATI，发现光谱中的某些干涉条纹来自分子结构，与激光场的参数无关。基于频域理论，我们详细分析了SF 6分子不同轨道的干涉条纹。发现在高动量值区域中SF 6的轨道可以用几项简化，其中来自这些项的破坏性干涉条纹可以携带分子结构的信息。此外，我们从这些简化的轨道中获得破坏性干涉公式，可以预测ATI频谱上的干扰条纹。此外，我们可能会获得有关分子键长的信息。