Fig. 1. Schematic diagram for the experimental setup and the optical path

Fig. 2. Experimental photoelectron spectra of Xe ionized by the linearly polarized laser field at the two wavelengths of 800 nm and 1500 nm

Fig. 3. Experimental yield of O2+ as a function of the laser intensity at the two different wavelengths of 800 nm and 1500 nm for different polarizations.(a) LP; (b) CP

Fig. 4. Theoretical yield and its ratio of O2+ at the two wavelengths of 800 nm and 1500 nm as a function of the laser intensity for different polarizations. (a) Yield for LP; (b) yield for CP; (c) yield

Fig. 5. Calculated momentum distributions of electrons from O₂ at the two wavelengths of 800 nm and 1500 nm for the intensity of 20 TW/cm² for different polarizations. (a) LP; (b) CP