We have investigated the angle-resolved ATI spectrum of oriented molecules in the IR+XUV co-rotating circular laser fields. According to the different roles of IR and XUV laser in the ionization process, we purposefully adjust the photon energy of XUV and the intensity of IR laser to make the ionization spectrum of the molecule distributed in a suitable momentum region. Moreover, under the same laser conditions, the background fringes in the ionization spectrum of the molecule can be removed by using the ionization spectrum of the atom with the same ionization energy as the molecule, so that the molecular orbital density distribution in the suitable momentum region can be obtained. That is, for any unknown molecule, as long as the ionization energy of the molecule can be measured, the density distribution of the molecular orbital can be imaged in a definite momentum region by adjusting the laser field conditions, which may shed light on the experimental detection of molecular orbitals.

中文翻译：

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用频域理论想象IR+XUV同转圆形激光场中分子轨道的密度分布

我们研究了 IR+XUV 同向旋转圆形激光场中定向分子的角度分辨 ATI 光谱。根据IR和XUV激光在电离过程中的不同作用，我们有目的地调节XUV的光子能量和IR激光的强度，使分子的电离谱分布在合适的动量区域。而且，在相同的激光条件下，利用与分子电离能相同的原子的电离谱，可以去除分子电离谱中的背景条纹，从而使分子轨道密度分布在合适的动量区域可以获得。即对于任何未知分子，只要能够测量出分子的电离能，通过调节激光场条件，就可以在确定的动量区域内成像分子轨道的密度分布，这可能为实验提供依据。分子轨道的检测。