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The direct above-threshold ionization (ATI) of diatomic molecules inlinearly-polarized infrared and extreme ultraviolet (IR+XUV) laser fields isinvestigated by the frequency-domain theory based on the nonperturbativequantum electrodynamics. The destructive interference fringes on theangle-resolved ATI spectra, which are closely related to the molecularstructure, can be well fitted by a simple predictive formula for any alignmentof the molecular axis. By comparing the direct ATI spectra for monochromaticand two-color laser fields, we found that the XUV laser field can both raisethe ionization probability and the kinetic energy of the ionized electron,while the IR laser field can broaden the energy distribution of the ionizedelectron. Our results demonstrate that, by using IR+XUV two-color laser fields,the angle-resolved spectra of the direct ATI can image the structuralinformation of molecules without considering the recollision process of theionized electron.

Angle-Resolved Spectra of the Direct Above-Threshold Ionization of Diatomic Molecule in IR+XUV laser field