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

Imagining density distribution of molecular orbitals in IR+XUV co-rotating circular laser fields by frequency-domain theory